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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 railway bureau is required to issue a traffic dispatch order, which is formulated by the railway bureau.
Most babies do not have adverse reactions after vaccination. Some baby vaccinated will fever, headache, loss of appetite, needle eye redness and swelling, pain or inflammation such as scleroma, this is the general response to vaccines, this kind of reaction generally do not need special treatment, 2 ~ 3 days to recover on its own. Due to individual differences, such as allergic constitution, some vaccines may occur in cases such as rash, anaphylactic shock and other allergic reactions. This is an abnormal reaction and needs to be treated in the hospital. Also some babies vaccination is a disease of disease, or there has not yet found the basis of the incubation period after vaccination coincidence, known as coupling, coupling and vaccine itself has nothing to do.
Step up transformers increases the voltage level from primary to secondary but with the corresponding decrease in the current and vice versa.
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