A. 对于可塑状黏性土可采用厚壁敞口取土器采取Ⅱ级土样
B. 当采用146套管时，取原状土样的位置低于套管底端0.50m
C. 护孔套管泥面以上长度不可超出泥面以下长度的2倍
D. 钻孔终孔后进行水位观测以统一校正该孔的进尺
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