问题
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工作场所操作人员每天连续接触8小时噪声的限值是__________。A.85 dB B.85 dB(A) C.60 dB(A) D.60
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工作场所操作人员每天连续接触8小时噪声的限值是__________。A.85 dB B.85 dB(A) C.60 dB(A) D.60
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1/2,1,4/3,19/12,__________。 A.133/60B.137/60C.107/60D.147/60
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60._________A. whateverB. howeverC. whicheverD. w
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60._________A. rankB. heightC. amountD. volume
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60._________A. dealingB. negotiatingC. havingD. a
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