矽尘作业规定粉尘中含游离二氧化硅的含量不少于(  )A.5% B.10% C.15% D.20% E.25%

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问题 矽尘作业规定粉尘中含游离二氧化硅的含量不少于(  )

选项 A.5%
B.10%
C.15%
D.20%
E.25%

答案B

解析
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