井下作业场所空气粉尘中游离Si02含量超过10%时,总粉尘的最高允许浓度不 得大于( )。A. 1 mg/m3 B. 2 mg/m3 C.5mg/...

作者: rantiku 人气: - 评论: 0
问题 井下作业场所空气粉尘中游离Si02含量超过10%时,总粉尘的最高允许浓度不 得大于( )。
选项 A. 1 mg/m3 B. 2 mg/m3 C.5mg/m3 D.10mg/m3
答案 B
解析
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