试题与答案

埋设污水管道时必须防止管道壁因地面活荷载而受到破坏,车行道下的污水管道最小覆土厚度一

题型:单项选择题

题目:

埋设污水管道时必须防止管道壁因地面活荷载而受到破坏,车行道下的污水管道最小覆土厚度一般不宜小于()。

A.0.5m

B.0.6m

C.0.7m

D.0.8m

答案:

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参考答案:30(8525.8011)

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Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
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