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洁净度评定标准
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洁净度评定标准
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洁净环境检测
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evaluation criteria of air cleanliness
洁净度评定标准
为规范洁净室的洁净度等级,各国和地区所制定的检测要求和标准。一直以来,各国都采用美国联邦标准给出的洁净室洁净度评定标准。
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Rural Opera Performance on a Winter Day
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