月度归档： 2025 年 7 月

　　After the outbreak of the epidemic in Shanghai, nearly 10,000 veterans responded to the emergency recruitment of the Shanghai Veterans Affairs Bureau, signed up anti-epidemic volunteers and went to the front line of epidemic prevention and control. Among them, the youngest is a 21-year-old college student. Because he has more experience as a soldier than his peers, he has more responsibility and responsibility as a soldier, and he has used the youthful blood of a retired soldier to contribute his youthful strength to Shanghai’s fight against the epidemic.

　　Chen Yingxi: National Flag Class Soldiers "stand guard" for the community

　　Chen Yingxi, who just retired from the army last year, was a national flag fighter of the squadron of "Good Eighth Company on Nanjing Road" of the Armed Police Shanghai Corps. It wasn’t long before I went back to school, and I encountered this wave of epidemic. Before the blockade, Chen Yingxi was a "big white" patrolling the campus. The school changed online teaching and returned to his home in Kangqiao Town, Pudong New Area. He discussed with his parents: "I have been a soldier and I am young. When the masses need it most, I should take the lead." With the support of parents, Chen Yingxi became a volunteer in the community, responsible for express delivery, sterilization of take-away items and material handling.

　　There are more than 5,000 households in the community. During the closure period, all kinds of materials, such as express delivery, group purchase and government distribution, ranged from hundreds to thousands, and served as the last checkpoint for goods transshipment, which required high disinfection tasks and great responsibilities. For the health and safety of the residents in the community, he took out a more sincere attitude when he was in the national flag class, and always stood ready to effectively disinfect all materials one by one. After a shift, you have to endure not only the pungent smell, but also the feeling of "sauna" in protective clothing.

　　During the rotation, I often meet the courier brother who wants to leave after putting things down and refuses to cooperate with me to produce the nucleic acid report. Chen Yingxi is as strict as a sentry, never letting go of anyone: if you don’t produce the nucleic acid report, the courier will not reach the customer, which will directly affect your performance … … In the face of such a competitive "big white", express delivery and takeaway brothers have also cooperated.

　　Chen Yingxi said that no matter how hard and tired we are, we must stand up for the community and hold this "safety" pass for everyone.

　　Tan Zhipeng: "Carrying the Girder" with his predecessors

　　Tan Zhipeng, a freshman, once served in a naval unit in the Eastern Theater. A family of three, my father fights the epidemic in the street every day, and he and his mother are volunteers in the community. After learning about the recruitment order of Shanghai Retired Military Affairs Bureau, he immediately signed up as the only "post-00" in his retired military volunteer group.

　　"As a young man, it is my duty to contribute to society. As a retired soldier, I hope to hone my will in volunteer service. " Before leaving, Tan Zhipeng wrote in his diary, "At this moment, my initial intention of going to the front line of fighting the epidemic is the same as my initial intention of joining the army three years ago."

　　On April 11th, Tan Zhipeng came to a food company to support him with the third group of the anti-epidemic emergency vanguard of retired soldiers in Baoshan District. He followed the players of his father’s age and was responsible for carrying food and supplies. For two whole days, he and his comrades-in-arms cooperated tacitly like an assembly line to ensure that the materials were in place as soon as possible. At the moment of completing the task, he felt that his waist could not stand up straight and his calves were shaking, but no one complained at the scene, and every comrade-in-arms admired him. He was deeply shocked to see his teammates go to the next "battlefield" non-stop, so he also signed up for a village in Sitang, Zhangmiao Street, where the epidemic was serious, to help medical staff volunteer for nucleic acid sampling. At the moment of putting on the big white, standing on the front line of real epidemic prevention, the sense of mission of the soldiers came back.

　　Organizing residents to go downstairs to do nucleic acid, keeping a safe distance and queuing in order, the seemingly simple process is not simple to implement. During that time, Tan Zhipeng often had a hoarse throat and his skin was red and swollen because of sweating for a long time, but his heart was full of the power of charge.

　　Peer teammates found that there was another "baby soldier", but also warmly guided and helped him. Many players sighed: my family is still sleeping after 00, which is different when I was a soldier!

　　Lu Chenjiayu: "Minor injuries can’t go down the line of fire"

　　Lu Chenjiayu, a college student of Shanghai Jiguang Vocational and Technical College, was once an air force soldier. In mid-March, Lu Chenjiayu, who lives at home, signed up as a community volunteer. When he saw the volunteer recruitment order issued by the Shanghai Veterans Affairs Bureau, he immediately signed up for the job.

　　On April 16th, Lu Chenjiayu was incorporated into the information group of an isolated hotel in Shanghai North Bund. A group of three people is responsible for the statistics, production and summary of all information reports of the isolated hotel, as well as the auxiliary medical group. Faced with dozens of forms of data and completely unfamiliar disease control terms, he straightened out the complicated reports and data with the rigor and meticulousness of air force soldiers, and proposed to increase data checking procedures to ensure the accuracy of daily reporting rate.

　　On April 23rd, in the information group where Lu Chenjiayu was located, two comrades were isolated one after another, and only one combatant was left in the information group. In the case that the replacement volunteer has not yet arrived at the post, he shouldered the work of the original three people alone, and at this time, he had induced tonsillitis a few days ago due to overwork. The next day, Lu Chenjiayu was also sentenced to close contact and isolated on the spot. However, he was on duty alone while being isolated, overcoming difficulties and sticking to his post with overload until the replacement volunteers arrived at his post three days later. At the end of the 14-day quarantine, Lu Chenjiayu, who performed well, was named and praised. When he should have gone back to rest, he saw that the group was still short of people, and he did not hesitate to devote himself to the intense and busy fight against the epidemic.

[Four-wheel drive details] In the last issue of the four-wheel drive series, we introduced various types of four-wheel drives and their classification (click to view the basic knowledge of four-wheel drive). In the following articles, we will analyze and test the four-wheel drive models of various brands one by one, and the first article we introduce brands to you, including,,, and so on.

● Jeep brand introduction

The first Jeep in the world was produced in 1941 to meet the requirements of the US military in World War II. It has a history of 73 years. From July 23, 1941 to now, Jeep brand has always insisted on only making SUV models, and left a tough guy image in people’s minds. Today, the Jeep brand has even become synonymous with off-road. It is precisely because of this that Jeep cars have been sold to nearly 100 countries and have many Jeep enthusiasts around the world.

● Jeep origin

Jeep was born out of the Willys)MB model used by the Allied Forces during World War II. In 1940, the U.S. military established the model scheme of Willys MA, and at the same time, borrowed some characteristics of Ford and Bantam, and redesigned the Willys MB off-road vehicle, which made this earliest standardized "Jeep" car.

Once Jeep is used, it has made great achievements. Jeep has played many roles in various war zones: stretcher, machine gun rack, reconnaissance vehicle, light truck, front-line vehicle, gun and ammunition transportation, etc. During the Second World War, about 600,000 Jeeps joined the battle. The name of "Battlefield Taxi" confirmed the success of Jeep products.

Since then, Jeep has entered the era of peace with its innate excellent characteristics, and it has become more and more perfect after repeated improvements. Of course, it has kept its original passion and wildness to this day and become one of the automobile brands. The Jeep trademark registered in 1950 has remained vigorous for more than 60 years.

● Domestic Jeep models for sale and

At present, Jeep brands on sale in China mainly include many models, such as Guide, Freerider, Freelight, Grand Cherokee, herdsman, etc. Different product positioning of each model makes their four-wheel drive system forms different. See the table below for specific classification:

● Test props/test rules

Let’s get to know the pulley block and test rules we used in this test. This pulley block consists of three groups of flat pulleys, and each group of pulleys can determine its locked/opened state through the side locking pin. When a pulley block is locked, the wheels will not slip when passing through the pulley block; On the contrary, when a pulley block is open, the wheels will slip when passing through the pulley block, thus losing power.

We will test each model in three groups. In the first group, two front wheels or two rear wheels of the vehicle are in the pulley block, which can test the inter-axle distribution of different four-wheel drive forms with front drive or rear drive as the mainstay. The second set of tests is to make the diagonal wheel in the pulley block, and the third set is to make all three wheels in the pulley block, and only one front wheel or rear wheel is in contact with the ground. This will test the torque distribution between the front and rear axles of the vehicle and the torque distribution between the left and right respectively.

Fortunately, after the actual test, the above cars can easily complete the first and second sets of tests, so next we will directly show you their performance in the face of three sets of open pulleys.

● Introduction to the structure of four-wheel drive for guide and freelancer

Guide and freelancer are two types of Jeep. Strictly speaking, the two cars are only different in appearance and interior design, while the power system and four-wheel drive structure are exactly the same.

"guide" and "free guest"

Guides and freelancers are equipped with a four-wheel drive system called "Freedom-Drive". The four-wheel drive system is simple in structure, with an open differential at the front and rear, and a common electrically controlled multi-plate structure. In extreme cases, the power distribution between the front and rear axles can be locked at 50:50. In addition, the electronic auxiliary system can help the vehicle realize the power distribution between the left and right wheels by braking.

● Guide and Freelancer Four-wheel Drive Operation Keys

For urban SUVs, such as guides and freelancers, which adopt timely four-wheel drive system, there is no need for manual operation during daily driving, and the computer will automatically distribute the front and rear wheel power according to the driving road conditions. In case of complicated road conditions, the driver can manually turn on the "LOCK" switch, and the torque of the front and rear axles will be distributed at a fixed ratio of 50:50.

● Guide and Freelancer Four-wheel Drive Test Performance

Both the Guide and the Freelancer are four-wheel drive systems based on front-wheel drive. Theoretically, the rear wheels can only get 50% of the maximum power. Therefore, facing three groups of open pulleys, the difficulty of passing forward and backward is also different. When only one front wheel touches the ground, it is easier for the vehicle to get out of trouble. When only one rear wheel touches the ground, the vehicle can also pass, but the process is not easy. Because this four-wheel drive structure determines that the power transmitted to the rear axle is only 50% at most, although the electronic auxiliary system can play the role of limiting slip between wheels, the weak power output still makes the vehicle struggle. If "4WD LOCK" is turned on manually, the system will allocate power at 50: 50 by default, and the situation will be slightly improved.

From the four-wheel drive structure and test analysis, although the guide successfully passed the four-wheel drive test, its structure determines that it is not suitable for cross-country. The main function of this four-wheel drive system is to cope with the general potholes and improve the safety of highway driving.

More exciting videos are all on the car home video platform.

More exciting videos are all on the car home video platform.

Advantages:Daily driving is easy, the computer will automatically distribute the front and rear axle power according to the road conditions, without manual control, and the fuel economy is high. At the critical moment, the driver can also manually select the front and rear axle power distribution according to 50:50 to improve the performance of four-wheel drive.

Disadvantages:The power is average, the electronic slip limit between wheels is not crisp enough, and the multi-plate clutch central differential is easy to overheat, so it is not easy to challenge three open pulley blocks.

● Introduction of free light four-wheel drive structure

As a brand-new car of the Jeep family, the positioning of Free Light is aimed at luxury brands, and Jeep insists that SUVs at this price should have strong off-road capabilities even if they focus on urban comfort. Free light is an adopted SUV, which adopts a timely four-wheel drive system called "Active Drive". This four-wheel drive system is based on ZF’s "ECOnnect" four-wheel drive system (click to view ECOnnect), which transmits power to the rear axle through PTO (front axle power take-off) and multi-disc clutch. Different from most SUVs, the free-light PTO can completely disconnect the rear axle when necessary, and there is no need to rotate at this time (the central transmission shaft of most SUVs with transverse orientation is always rotating), thus improving fuel economy. In addition, its rear axle has a multi-disc clutch structure, and the multi-disc clutch of the low-profile vehicle acts as a central differential, which can control the torque distribution of the front and rear axles.

Free light has three different four-wheel drive models, namely Active Drive I, Active Drive II and Active Drive Lock. Among them, the low-profile model adopts Active Drive I timely four-wheel drive system, which is the four-wheel drive structure mentioned in the previous paragraph. Active Drive II can distribute power among rear axle wheels, because its rear axle RDU structure adopts two sets of multi-disc clutches, that is, the left and right axle shafts have one set of multi-disc clutches, and each set of clutches is used to independently control the torque required by the wheels on that side. In addition, the Active Drive II four-wheel drive system also adds a low-speed torque amplification gear with a transmission ratio of 2.92:1. The most powerful Active Drive Lock not only has a low-torque amplification gear, but also has the locking function of the rear axle differential. The driver can manually control the left and right wheels of the rear axle to distribute the torque by 50:50 through the buttons in the car.

● Free optical four-wheel drive operating system

"High-end models have low-speed four-wheel drive function, while low-end models don’t"

In addition, like many high-end SUVs, all models of Free Light also have a road mode self-selection system called "Selec-in". In different modes, the computer will adjust the power response and power distribution to ensure that the vehicle has the best ability to get out of trouble.

● Free light four-wheel drive test performance

Like the guide, the free light adopts a four-wheel drive system based on front wheel drive, so when one front wheel has adhesion, the vehicle is easy to get out of trouble. Then, when passing through three groups of open pulleys in the opposite direction (that is, only one rear wheel has adhesion), does free light struggle to get out of trouble, just like guides and free travelers? Actually, it is not, because the free light not only has electronic limited slip between the left and right wheels, but also the rear axle can distribute the torque through the multi-plate clutch limited slip differential, thus ensuring that the power can be transmitted to the wheels with adhesion more effectively.

The free light we tested adopts Active Drive II timely four-wheel drive structure, that is, PTO has low-speed torque amplification function. However, during this test, we didn’t turn on the "4WD LOW" low-speed four-wheel drive mode. In the AUTO mode, Free Light can pass the test of three groups of open pulley blocks, and both directions are relatively easy.

More exciting videos are all on the car home video platform.

No matter from the four-wheel drive structure or the actual test results, the Active Drive timely four-wheel drive system on free light is much more powerful than that on the guide, and it can face more complicated road conditions more easily.

Advantages:Daily driving is easy, the computer will automatically distribute the power between the front and rear axle and the left and right axle shafts of the rear axle according to the road conditions, and PTO can also be automatically disconnected when necessary, thus realizing the real front-wheel drive (the central transmission shaft does not turn). The low-speed four-wheel drive and the locking function of the rear axle differential of the mid-high model further improve its four-wheel drive performance.

Disadvantages:Multi-disc clutch limited slip differential is easy to overheat protection after continuous use for many times.

● Introduction of Grand Cherokee Four-wheel Drive Structure

At present, there are two full-time four-wheel drive structures in Grand Cherokee, one is a full-time four-wheel drive system with low-speed four-wheel drive and multi-plate clutch structure; On the other hand, the limited slip differential of the rear axle is added on this basis. The former is applied to 3.0L, 3.6L and 3.0TD diesel models, while the latter is applied to 5.7L models.

At present, Grand Cherokee provides two different four-wheel drive systems, among which "Quadra-Drive II" on the 5.7L model has a set of ELSD electronic limited-slip differential on the rear axle, so the driver can lock it manually, which is theoretically better in extreme cases.

● Grand Cherokee four-wheel drive operating system

The four-wheel drive operating system on Grand Cherokee is called Selec-Terrain, which has seven driving mode options: economy, sport, auto, snow, sand, mud and rock. In addition, the Grand Cherokee is equipped with 4WD LOW low-speed four-wheel drive function. Compared with Freelight, the operating system of Grand Cherokee not only has more optional modes, but also looks more scientific and technological in its overall interface.

● Grand Cherokee Four-wheel Drive Test Performance

However, for the Grand Cherokee, the whole test process is not easy. The reason is that when passing through three open pulley blocks, the power output will be limited by default. When we tried to close the electronic stability control program, the limited slip function between the left and right wheels was completely lost. At this time, the vehicle could not get out of trouble. Therefore, in order for the four-wheel drive system to work, the electronic stability control system must be turned on by default.

Despite the full-time four-wheel drive system, most SUVs with layout are more inclined to rear-wheel drive, and the Grand Cherokee is no exception. When passing through the pulley block in the opposite direction, its two rear wheels are suspended, and only by the grip of one front wheel can the vehicle get out of trouble. At this time, if the Grand Cherokee wants to get out of trouble successfully, it can only rely on the electronic slip limit between wheels to limit the power output of one wheel, so that the other wheel can have grip. However, due to the restriction of the electronic stability system on the overall power, it is a little difficult for the Grand Cherokee to get out of trouble this time.

However, it should be declared that during the whole test, we did not turn on the 4WD LOW button. In other words, Grand Cherokee completed this test completely in AUTO mode. If the 4WD LOW low-speed four-wheel drive mode is turned on, I believe the whole process will be much easier.

More exciting videos are all on the car home video platform.

Advantages:This system is simple in structure, and the operation mode is intuitive and convenient. Drivers don’t need to remember complicated driving mode switching steps. In most cases, Quadra-Tra II four-wheel drive system can handle it by itself. If necessary, the low-speed four-wheel drive mode can be started to increase the ability to get out of trouble.
Disadvantages:The electronic stability control system has too many restrictions on power, so it is difficult for a single wheel to get enough power to get the vehicle out of trouble.

● Introduction of herdsman four-wheel drive structure

Herdsman is the most powerful off-road vehicle in Jeep family today, among which Sahara is equipped with Command-Trac part-time 4wd system, which adopts NV241 series transfer case with low gear ratio of 2.72:1, and both front and rear axles are open differential. The part-time 4wd system equipped with Rubicon is called Rock-Trac, and its low-speed gear ratio of the transfer case is 4:1, and the front and rear axles are also equipped with electrically controlled locking Tru-loc. In addition, both cars are equipped with electronic slip-limiting function between E wheels.

● Herdsman four-wheel drive operating system

Sahara and Rubicon operate the part-time 4wd system in almost the same way, and there is a transfer case lever next to the shift lever. Select the gear position of 2H on the normal paved road, and the vehicle is in the state of rear wheel drive. Select the 4H high-speed four-wheel drive gear on the wet or soft road. At this time, the torque distribution of the front and rear axles is 50:50, and the speed of the front and rear axles is the same. Therefore, it will be very difficult for vehicles to turn on the paved road when the four-wheel drive is turned on. The 4L low-speed four-wheel drive gear is used in the state where high torque traction is needed. The special gear set in the transfer case amplifies the torque and transmits it to the front and rear axles in equal proportion, while the front and rear axles still maintain the same speed.

It should be noted that when switching from 2H to 4H, the vehicle speed should be lower than 88km/h.. If you switch to 4L, the speed needs to be lower than 5km/h, and it is better to stop and then put into 4L gear. In addition, the 4L state can only be used in the face of extremely challenging road conditions, when the speed cannot exceed 40 km/h..

Compared with Sahara, Rubicon’s strength lies in the addition of a mechanical differential lock on the front and rear axles. In the face of very harsh environment, it can also ensure that all four tires can get sufficient power.

● Herdsman four-wheel drive test performance

Both Sahara and Rubicon are equipped with electronic slip-limiting function between wheels. Theoretically, as long as the transfer case is selected in the 4H gear, its front and rear axles can get 50% power respectively, and different power outputs of the left and right wheels can be achieved through electronic slip-limiting function between wheels.

In this test, we found two herdsman, one of which is a 3.6L Longteng collector’s edition, which is a five-door model with the same four-wheel drive structure as Sahara. The other one is a 3.6L two-door version of Rubicon, which has two differential locks at the front and rear, and its off-road performance is more powerful.

In the face of three groups of open pulley blocks, we only chose the 4H mode, and the front and rear differential locks of Rubicon were not activated. The vehicle can successfully get out of trouble only by relying on the electronic slip-limiting function between EDS wheels. The 3.6L engine can provide excellent power output, and the electronic system is involved in the whole process in time. Only after a few brief slips of the suspended wheel, the other wheel can get sufficient grip, thus helping the vehicle to get out of trouble.

After selecting the 4H mode, the torque of the front and rear axles is completely distributed according to the ratio of 50:50, so when passing through the pulley block in both directions, the performance of the vehicle is basically the same, and there is no bias towards the front drive or the rear drive. Of course, in the conventional 2H mode, herdsman is a rear-wheel drive SUV.

More exciting videos are all on the car home video platform.

More exciting videos are all on the car home video platform.

Advantages:Part-time 4wd system can ensure strong off-road capability, which is the most reliable four-wheel drive structure at present.
Disadvantages:Operation and driving are more complicated than timely four-wheel drive.

Full text summary:

Generally speaking, various four-wheel drive structures under the Jeep brand should be regarded as having their own characteristics. In terms of off-road performance alone, herdsman Rubicon’s four-wheel drive system is undoubtedly the most powerful Jeep car. This pure hard-core off-road vehicle can be easily conquered in the face of many off-road projects and difficult road conditions, but there is no absolute perfection in the world. No matter Rubicon or Sahara, their driving experience on the road is not excellent, but this will not affect the love of those who pursue pure off-road at all.

In terms of comprehensive performance, Grand Cherokee and Freelight are both good, and although they are slightly inferior to herdsman in off-road performance, there is no problem in coping with common off-road conditions. More importantly, they have a good performance in road driving comfort, which is very suitable for friends who like off-road style and want to meet the daily road driving comfort.

Compared with the same SUV, the guides and freelancers are also excellent in off-road performance. However, after all, these two cars are SUVs oriented to ordinary consumers and located in cities. Road driving comfort and cost performance are the most important. (Text/Figure car home Zhang Ziyi)

Friends who need drinking water quality at home often see the figure of TDS test pen when choosing water purifiers, and the displayed value is often one of the criteria for judging the water quality of water purifiers.

Who is TDS? How do some water purifiers make the TDS value of tap water from hundreds to double digits or single digits?

TDS is total dissolved solids,The abbreviation of "total dissolved solids",Its numerical value represents the mass of dissolved solids in one liter of water, and the unit is mg/liter. The measuring tool is the pen-shaped TDS tester that we often see in evaluation and publicity.

Here we will find a BUG:The value displayed by TDS tester is the total amount of solid matter dissolved in water.

In fact, there are many kinds of solid substances in tap water, such as minerals and trace elements, calcium and magnesium salts that are easy to form scale, sediment dissolved in water, scale peeled off from transportation pipelines, rust and so on.

Because of the complexity of solid types, TDS meter can not accurately distinguish whether its composition is beneficial or harmful to human body.

For example, the TDS value of tap water we use every day is about 100-200, and the TDS value of mineral water sold in supermarkets is about 100, but mineral water can be drunk directly, but tap water is not.

Such a situation will inevitably be confusing. What is the significance of testing TDS value by water purifier? However, before further explaining this question, let’s take a look at the numerical requirements of national standards for tap water quality.

According to the limited requirements of TDS value of drinking tap water in the Hygienic Standard for Drinking Water in 2006, the TDS value of domestic water should be less than or equal to 1000 mg/L.

What kind of numerical concept is this? Generally, the TDS value of tap water in new residential buildings is 100-200, and the TDS value of tap water in older residential buildings will not exceed 500.

Generally speaking, as long as the urban water supply is not affected by various disasters, the daily drinking water will basically not exceed this limit.

However, this tap water quality requirement cannot meet the standard of direct drinking water. We were taught by our parents to boil water before drinking, and we didn’t have the habit of drinking tap water directly.

Moreover, the cost of direct drinking in waterworks is quite high, and there is also the problem of secondary pollution during transportation, which is not only unnecessary, but also difficult to achieve.

With the development of life, people more or less have certain requirements for the quality of tap water, not necessarily for direct drinking, but also for removing impurities, odor or scale in water, which reflects the existence value of water purifier.

Back to the original question, why does the water purifier evaluation show the TDS value of water quality?

The answer is very simple, in order to show the ultra-high filtration capacity of the water purifier, because it is difficult to tell whether the solids in the water are good or bad, so it is better to filter them all at once. There are no impurities in the water, so it can be drunk directly.

Only RO reverse osmosis water purifier can achieve such strong filtration ability.

This kind of water purifier fully filters all impurities including bacteria, viruses and microorganisms in water through the filtration precision of RO reverse osmosis membrane of 0.0001 micron. Only water molecules and a very small amount of trace elements can pass through, and the TDS value of naturally produced water is only single digits.

In addition to the reverse osmosis water purifier, there is also a common ultrafiltration water purifier on the market.

This kind of products can only filter tap water simply, remove large-particle impurities such as sediment and rust, and eliminate odor, while bacterial viruses and scale will still remain in the produced water.This kind of products can’t pass the TDS test to judge the water quality standard.

Smart brands will not introduce the specific differences of such water purifiers to consumers in detail. Common reverse osmosis water purifiers will promote "pure water" and "direct drinking", while ultrafiltration water purifiers will promote "no power consumption" and "mineral water" as features.

So is it necessary to choose reverse osmosis without thinking when buying a water purifier? Or choose ultrafiltration to drink "mineral water"? Let’s analyze it for you:

Reverse osmosis water purifier:

Advantage: excellent filtering effect, and that produce purified water can be directly drunk.

Disadvantages:

1. The reverse osmosis water purifier will produce wastewater.

2. When working, the water purifier pressurizes the water supply, which requires power consumption.

3. The filter element of reverse osmosis water purifier has a general service life of 3 years, and needs to be replaced when it expires, so the price is high.

Applicable environment:The water quality is hard and prone to water pollution problems, such as coastal salt tides and flood-prone areas.

Applicable people:There is a high demand for drinking water quality, especially for families who need to take care of infants and frail elderly people.

Ultrafiltration water purifier:

Advantages:

1. It can retain minerals in water, and is suitable for making tea and coffee to enhance the taste.

2. It can be used immediately after installation, and no electricity is needed.

3. Some product filter elements can be reused, and the replacement price is lower.

Disadvantages: tap water can only be simply filtered, and it needs to be boiled and drunk, which will produce scale.

Applicable environment:The tap water has many impurities, the water quality is soft, and it is not easy to be polluted.

Applicable people:There is no high requirement for water quality, and it is only necessary to simply filter impurities and odors at a lower cost to meet the needs of families who wash vegetables and cook daily.

Summary:

Although TDS meter is a reference for visually displaying water quality, it can only reflect the water purification effect of reverse osmosis water purifier.

As for the common ultrafiltration water purifier, the reference value of TDS meter is not significant. The simplest and reliable method is to boil tap water before drinking. I hope this article can help everyone who is buying a water purifier.

????In 2002, under the correct leadership of the Municipal Party Committee and the Municipal Government, the people of the whole city earnestly practiced Theory of Three Represents, closely focused on the three strategies of "rejuvenating the country through science and education, opening up to the outside world and sustainable development" and the five key points of "attracting investment, strategic adjustment of economic structure, developing high-tech industries, deepening reform and environmental construction", actively responded to the new changes in the domestic and international situation after joining the WTO, and forged ahead in unity, pioneering and innovating the national economy. The existing problems are: the structural contradiction of economy and the deep-seated problems of economic system are more prominent; The dominant position of industry has not yet been formed; Insufficient demand for investment, export and consumption; Social security and education under pressure; The life of some urban and rural residents is still very difficult.

　　 I. Synthesis

????Economic Aggregate: According to preliminary statistics, the city’s GDP in 2002 reached 15.10 billion yuan, an increase of 10.0% over the previous year. Among them, the primary industry realized an added value of 4.60 billion yuan, an increase of 14.0%; The added value of the secondary industry reached 5.20 billion yuan, an increase of 9.0%; The tertiary industry realized an added value of 5.30 billion yuan, an increase of 8.0%. The added value of primary, secondary and tertiary industries accounts for 30.5%, 34.7% and 34.8% of GDP respectively. The per capita GDP is 5036 yuan, or 609 US dollars.

????Fiscal revenue: The general budget revenue of local finance was 960 million yuan, up by 13.4% over the previous year, of which 340 million yuan was achieved at the city level, up by 19.5%, and 620 million yuan was achieved at the county (city) level, up by 10.4%. National tax revenue was 850 million yuan, up 9.5%, and local tax revenue was 720 million yuan, up 3.5%. The general budget expenditure of local finance was 2.13 billion yuan, an increase of 8.2% over the previous year. Among them, the city-level expenditure was 1 billion yuan, up 6.9%, and the county-level expenditure was 1.13 billion yuan, up 9.4 yuan.

????Price index: the annual consumer price index was 99.9%, of which the food price index was 100.8%; The price index of tobacco, alcohol and daily necessities is 100.8; The clothing price index is 95.9%; The price index of household equipment supplies and maintenance services is 97.2%; The price index of medical care and personal goods is 98.0%; The price index of transportation and communication is 98.5%; The price index of entertainment, education, cultural goods and services is 102.3%; The residential price index is 101.3%.