A. 桩长为10～30m时，每孔截取3组芯样
B. 上部芯样位置距桩顶设计标高不宜大于3倍桩径或1m
C. 缺陷位置能取样时，应截取一组芯样
D. 同一基桩的钻芯孔数大于1个，其中一孔在某深度存在缺陷时，应在其他孔的该处深度处截取芯样
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