A. 初步勘察阶段钻孔平面位置的允许偏差是详细阶段的两倍
B. 当需对地层进行鉴别时，钻孔孔径不宜小于36mm
C. 在岩层中钻进时，破碎岩层岩芯采取率不宜小于80%
D. 测量黏性土含水层的静止水位时，停钻时间不得少于24h
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