浄化安全一題
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選択題： �升降人员或升降人员和物料用的钢丝绳断丝数达到必须更换。（）。 A、正确B、错误
可通过皮肤损害人体健康。、汞B、尘土C、碳
升降人员或升降人员和物料用的钢丝绳断丝数达到必须更换（A）、正确B、错误��可通过皮肤损害人体健康A、汞B、尘尘C、碳
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