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The rapid development of air filters is closely related to the development of military industry and electronic industry. In the first world war, the use of various chemical agents, asbestos fibre filter paper as the smoke filter layer of military gas masks came into being. The glass fiber filter medium is used in air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States studied the production process of glass fiber filter paper, and the air filter was improved and developed. In the 1960s, HEPA filters came out; In the 1970s, the filter paper of fine glass fiber was used as the HEPA filter of filter medium, and the filtration efficiency of particle size of 013 micron particle diameter was 99.9998%. Since the eighty s, with the emergence of new test method, use evaluation to improve and to improve the filtering performance requirements, found the HEPA filter there is a serious problem, and he had a higher ULPA filter performance. Countries are still working on it and expect more advanced air filters soon
Enzo ferrari, the founder of ferrari, said: "his favourite car is the one he hasn't built yet, and his greatest success has been his unachieved success." The Italian, known as the "father of racing cars", has been bubbling with a voracious blood. When he was 13, he finally convinced his father to start his own history of driving alone. The roar of the engine on the racetrack, the thrill of the game and the thrill of the game made him more than brave. He drove Alfa Romeo, winning, winning and being hailed as a "cavalier" by his teammates. He went to the race car to build a racing club and eventually started his own car company. Ferrari is known as the red devil.
When you decrease your fat percentage to under 7 percent, one's body has another appearance. Not only do veins arrive in minute detail, but cross-striations of the muscles become apparent, so you'll appear to be an anatomy chart, an image of muscles with the skin stripped away. That's a condition which has led to a good deal of controversy. With today?s champions, unlike that relating to yesteryear, one's body fat percentage often fluctuates in accordance with the stage with their training. It is not uncommon for a competitive bodybuilder to slice their body fat by 2 / 3 before a competitive sport.
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