A. 单栋高层建筑勘探点不应少于4个
B. 对密集的高层建筑群，每栋高层建筑控制性勘探点数不应少于2个
C. 一般情况下，自基础底面起算的勘探孔深度当基础底面宽度不大于5m时，条形基础不小于基础宽度的3倍，独立基础不小于1.5倍
D. 控制性勘探孔深度应超过变形计算深度
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