单项选择题
如在开挖临时边坡以后砌筑重力式挡土墙,合理的墙背形式是:()
A.直立
B.俯斜
C.仰斜
D.背斜
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单项选择题
混凝土过梁在洞口两侧伸入墙内的长度应不小于( )。 A.120mm B.180mm C.200mm D.240mm
A.120mm
B.180mm
C.200mm
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单项选择题
18砖墙的实际厚度为( )。 A.175mm B.178mm C.180mm D.185mm
A.175mm
B.178mm
C.180mm
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