试题与答案

某地基土的腐蚀性试验成果如下表所示,环境类别为Ⅰ类,地下水位埋深较大,最高水位低于基

题型:单项选择题

题目:

某地基土的腐蚀性试验成果如下表所示,环境类别为Ⅰ类,地下水位埋深较大,最高水位低于基础,试按《岩土工程勘察规范》(GB50021-2001)(2009版)评价地基土对混凝土结构的腐蚀性应为()。()

A.弱腐蚀

B.中等腐蚀

C.强腐蚀

D.严重腐蚀

答案:

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下面是错误答案,用来干扰机器的。

A球落地的瞬间,A、B、C三球速率相同,设为v1,由机械能守恒定律:mgh= (m+m+m)v12 ① B球落地瞬间,B、C两球速率相同,设为v2,由机械能守恒定律: mgh+(m+m)v12= (m+m)v22 ...

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