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【单选题】
根据《安全生产法》的规定,下列选项中( )不是生产经营单位主要负责人的安全生产职责。
A.
建立、健全本单位安全生产责任制
B.
保证本单位安全生产投入的有效实施
C.
及时、如实报告生产安全事故
D.
为从业人员缴纳保险费
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B.
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【单选题】集料的公称粒径通常比最大粒径( )。
A.
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B.
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【单选题】集料的公称粒径通常比最大粒径( )
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one
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that
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【判断题】集料公称最大粒径指集料可能全部通过或允许有少量不通过(一般容许筛余不超过10%)的最小标准筛筛孔尺寸。通常比集料最大粒径小一个粒级。()
A.
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B.
错误
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