题目内容

多层房屋建筑工程详细勘察阶段的勘探深度的说法，不正确的是（）。

A. 勘探孔深度对条形基础不应小于基底宽度的3倍，且不应小于5m
B. 控制性勘探孔的深度应超过地基变形计算深度
C. 有软弱下卧层时应适当加深控制性勘探孔的深度
D. 当在规范规定的深度内遇到厚层碎石土或基岩时，勘探孔的深度可适当调整

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