关于建筑机具的安全操作,正确的说法是( )。

关于建筑机具的安全操作,正确的说法是( )。A.建筑机具只能由经过专业培训、考核合格取得特种作业操作证的专业人员使用 B.机械设备发生故障,必须切断电源后,操作

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Milk That Paid a Medical Bill  One day, a poor boy who was s

Milk That Paid a Medical Bill  One day, a poor boy who was selling goods from d

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The experiment proved to be satisfactory.

The experiment proved to be satisfactory.A.Right B.Wrong C.Not mentioned

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The food is insufficient for three people.

The food is insufficient for three people.A.instant B.infinite C.inexpensive D.i

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有一起基坑支护结构破坏事故,一死三伤,直接经济损失约10万元。按照《工程建设重大事故报告和调查程序规定》的划分,应定为(

有一起基坑支护结构破坏事故,一死三伤,直接经济损失约10万元。按照《工程建设重大事故报告和调查程序规定》的划分,应定为( )重大事故。A.一级 B.二级 C.三

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