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问题 多项选择题

悬挑结构沿悬臂梁、板根部断裂的主要原因是（）

A.悬挑结构根部钢筋错位、变形

B.荷载过大超出悬臂构件的承载力

C.混凝土震捣不密实

D.施工中模板支撑方案不当

答案

参考答案：A, B

单项选择题

The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.

A. manage B. save
C. backup D. dispose of
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单项选择题

打开电气设备前，应先停电，开关把手打到零位并闭锁，检查开关附近环境瓦斯浓度低于（）%以下时，方可打开电气设备。

A.1

B.2

C.6

D.4
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