A. 季节性冻土的勘探深度必须超过年最大冻结深度
B. 多年冻土地带的路基工程的勘探深度不应小于2~3倍的天然上限深度
C. 多年冻土地带的中桥与大桥的地基勘探深度不应小于15m~20m，而小桥和挡土墙不应小于10m~15m
D. 多年冻土地带的隧道勘探深度必须达到洞底标高以下相当于1.5倍的天然上限深度
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