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问题 单项选择题

高桩码头预制构件存放按三点以上受力状态设计的预制构件，宜采用（）支垫存放。垫木应均匀铺设，并应注意场地不均匀沉降对构件的影响。

A.两点

B.五点

C.三点

D.多点

答案

参考答案：D

选择题

It is several years since he ______ ill and his illness _______ great damage to his health.     [ ]

A. fell; has done  

B. fell; does  

C. was; had done    

D. felt; has done
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判断题

混凝土泵在输送混凝土前，管道应先用水泥浆或水润滑。（）
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