前言：图书馆内污染物按性质分为化学性污染物、物理性污染物、生物性污染物和放射性污染物。
In library, the contaminations can be divided into four parts: i. e. chemical contamination, physical contamination, biological contamination and radioactive contamination.
前言：图书馆内污染物按性质分为化学性污染物、物理性污染物、生物性污染物和放射性污染物。
In library, the contaminations can be divided into four parts: i. e. chemical contamination, physical contamination, biological contamination and radioactive contamination.
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