单项选择题
公共场所内甲醛的允许浓度为()
A.<=0.05mg/m3
B.<=0.1mg/m3
C.<=0.15mg/m3
D.<=0.3mg/m3
E.<=0.5mg/m3
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单项选择题
公共场所内甲醛的允许浓度为()
A.<=0.05mg/m3
B.<=0.1mg/m3
C.<=0.15mg/m3
D.<=0.3mg/m3
E.<=0.5mg/m3
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