在明挖扩大基础施工过程中,如用机械开挖基坑,挖至坑底时,应保留不小于( )cm厚度的底层,在基础浇筑圬工前用人工挖至基底标高。A.10 B.20 ...

作者: rantiku 人气: - 评论: 0
问题 在明挖扩大基础施工过程中,如用机械开挖基坑,挖至坑底时,应保留不小于( )cm厚度的底层,在基础浇筑圬工前用人工挖至基底标高。
选项 A.10 B.20 C.30 D.50
答案 C
解析 如用机械开挖基坑,挖至坑底时,应保留不小于30cm厚度的底层,在基础浇筑圬工前用人工挖至基底标高。

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