题目内容

This matter is not very important, and should not ____ us very long.

A. detain
B. withhold
C. prevent
D. refrain

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Fill the following animals in the following blanks.bee fox bat lamb rabbit tiger lion peacock1. as blind as a __2. as brave as a 3. as busy as a _4. as cunning as a 5. as fierce as a 6. as gentle as a 7. as proud as a 8. as timid as a _____

半无限大物体的非稳态导热是非正规状态非稳态导热。

A. 对
B. 错

基坑开挖时，若采用表面直接排水，坑底将受到向上的动水力作用，发生（）现象

A. 管涌
B. 基坑涌水
C. 流砂

为了防止管涌现象发生，可设置（）

A. 渗透层
B. 透水石
C. 反滤层