|
Looking for a nice mechanic is not a trivial or easy course of action, particularly if lack extended knowledge on cars. But in case you do consider yourself to be somewhat of a car guru, it is still challenging to evaluate if you have selected the proper mechanic to suit your needs. There are a lot of mechanics on the market, and a lot of of which won't hesitate to rip you off or install a low-quality part. That is why you will need to require some things under consideration desire what car shop to enter, for example the way it looks externally, its reputation, as well as, the retail price.
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
New Car Buying Tips--


Copyright ?1998-2017 Technews Corp, All rights reserved
|
