A. 贯入器管靴长度不超过76cm
B. 钻孔孔底残土厚度不应大于15cm
C. 标准贯入试验孔在地下水位以上，应干钻，避免地下水对土浸泡
D. 贯入器放入孔底开始贯入后，应及时地记录每打10cm的锤击数，累计打入30cm的锤击数为标准贯入试验锤击数N
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