题目内容

井底车场是连接主、副井和大巷或石门的一组巷道和硐室的总称。

A. 正确
B. 错误

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煤矿企业必须加强职业危害的防治与管理,做好作业场所的职业卫生和()。

A. 劳动保护工作
B. 防疫
C. 卫生
D. 防寒防冻

During loading or discharging,where the delay is due to the Shipowner’s fault,or that of his servants or agents acting within their authority,the time actually delayed is to be()in calculating lay days.

A. precluded
B. included
C. excluded
D. diluted

洗涤(萃取工艺中)指什么?

支架正常工作时的要求是什么?

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