The temperature of external air is now reduced to 15-20 degrees from the normal 25-34 degrees and is moisture-dropped the remaining 50-60% RH from the usual 70% RH, there are about resulted in a clean room humidity decreases below the standard value. That this did not "occur frequently. Expected to occur, the date range 25-jan 27, 2016 (according to a report of the Meteorological Department). When the external air temperature and humidity into the normal State would cause the moisture in the clean room is located in the standard values.
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