公共场所内甲醛的允许浓度为() A.

shuhaiku2020-05-20  16

问题 公共场所内甲醛的允许浓度为()A.<=0.05mg/m^3B.<=0.1mg/m^3C.<=0.15mg/m^3D.<=0.3mg/m^3E.<=0.5mg/m^3

选项

答案B

解析
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