题目内容

下列关于筏形基础施工的说法，不正确的是()。

A. 当地下水位影响基坑施工时，应采取人工降低地下水会或隔水措施
B. 当采用机械开挖时，应保留100～150mm土层人工挖除
C. 基坑开挖完成并经验收后，应立即进行基础施工
D. 基础长度超过40m时，宜设置施工缝

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