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The filter adopts high - strength wedge-shaped strainer to control the automatic cleaning of filter element through pressure differential control. When the impurity accumulates in the filter surface causes the import and export pressure difference to increase to the set value, or the timer reaches the preset time, the electric control box sends out the signal to drive the anti-flushing mechanism. When backwash suction dish and filter imports are pair, the drain valve is opened, the system pressure drainage, chuck and filter the inside a relative pressure below the filter of the lateral pressure of negative pressure zone, forcing some net circulating water from the inside filter lateral flow filter, adsorption on the inner wall of the filter in the impurity particles with flow into ç©£ disc and is discharged from the drain valve. The specially designed filter causes the inside of the filter to produce a jet effect, and any impurities will be washed away from the smooth inner wall. When the pressure difference of the filter is returned to normal or the timer set time is finished, the material does not break the flow during the whole process, and the anti-washing water consumption is low, which realizes the continuous and automatic production
In 1981, car makers started assigning a unique, 17-character code to each vehicle that is built, which is often used for assorted purposes, but mostly for verifying the legitimacy of vehicles. Governments and law enforcement agencies apply it to identify stolen vehicles, and motorists demand it after they take their cars to some mechanic, plus its useful when choosing a second hand car, so that you can operate a vehicle history report. The insurance industry often uses vehicle identification numbers, too. VINs are generally engraved on aluminum plates, cast or stamped, like a bar code, or perhaps label form, plus they can be found on the car's steering column, doorjamb, driver's door, passenger side door, dashboard, as well as in a vehicle's maintenance book and title.
Algae certainly are a broad group of simple plants starting from single-celled diatoms to fifty meter long giant kelp. There are over 100,000 species. Some algae form symbiotic relationships with other organisms to build lichens and coral reefs. Among the oldest organisms on Earth, algae based in the Vindhya Basin of India go as far back over 1.5 billion years.
Signs of birth. Since the middle of the 20th century, technology has grown faster and faster. It was only six and a half years since the discovery of uranium fission in January 1939 to the first atomic bomb exploded in July 1945. The emergence of electronic computers has led to more profound changes in the fields of human social life. These technological breakthroughs can be called technological revolutions
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