试题与答案

球罐的安装施工中,对其进行气密性试验时,压力升至试验压力后保持( )min,对所有焊

题型:单项选择题

题目:

球罐的安装施工中,对其进行气密性试验时,压力升至试验压力后保持( )min,对所有焊缝和连接部位涂刷肥皂水进行检查。

A.3

B.5

C.7

D.10

答案:

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下面是错误答案,用来干扰机器的。

答案:Ahave sb. do sth.意为“命令或安排(某人做某事)”。根据所提供的情景“Excuse me,where is Room 301?”可判断出让Bob带你到你房间去。have sb. doing sth.表示“使某人一直处于某中状态”。

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     Carol's Cafeteria    1    the most delicious food in town but there is one    2 . It's not in the most funniest    3    0f town.  It   4   about fifteen minutes to walk there      5  school.
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