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High efficiency air filter is generally used as the filter end, so the requirements for high efficiency filters are also the most stringent. High efficiency filters are the most critical level of filter at all levels and require additional "viewing". The most fundamental way to extend the life of an efficient filter is to keep the dust in the prefilter. The replacement of pre-filtration usually does not need to be discontinued, without debugging, so experienced owners will put their attention and money on the prefilters. For the 10,000 and 100,000 clean plants. Prefiltration can be used with F8 filter, which can last up to five years. F8 filters are the most common prefilters in foreign projects and domestic new projects. For chip plant 100, level 10 or higher, the common efficiency level of prefilters is H10, and many new items are selected for HEPA. In the design of clean room air conditioning system in the past, the filter is commonly configured as: effective and efficient. At that time, the life of high efficiency filters was only 1--3 years, and the worst was months. Therefore, the efficiency of the prefilter determines the life span of the end-filter
The Tokyo motor show is a relatively short history of the five major auto shows, known as the "Asian car weathervane", which was founded in the 1950s and was held in the autumn of the last century. The Tokyo motor show is the largest international motor show in Asia. The first international auto show began in 1954. Tokyo has a deeper impact on the world car market and is of greater importance to the Asian auto market. The exhibition, held in chiba prefecture, near Tokyo, Japan, offers a variety of electronic 3d display equipment that gives visitors a sense of "vertigo". The Tokyo auto show in 1999 set a world record of 1.4 million visitors and saw its excitement. Compared with other major western auto shows, the Japanese auto show has more Asian Oriental charm. Japanese manufacturers have a number of small, elegant, high-end cars that can be the main character of the auto show. The Tokyo auto show takes turns showing cars and commercial vehicles each year, and the 2003 Tokyo auto show focuses on commercial cars and motorcycles. The Tokyo motor show has a distinctive feature: a variety of small, diverse cars from Japan's local carmakers have traditionally been the main actors in the show. At the same time, various car electronic equipment and technology are also a highlight of the exhibition
After the construction has been completed, the train with the specified speed limit shall be designated.
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