A. 人为坑洞地区勘探时，应在调查及收集资料的基础上，采用综合物探，辅以钻探，简易勘探等方法
B. 人为坑洞地段勘探时应注意有害气体对人体造成危害
C. 人为坑洞地段勘探深度应超过坑洞深度，最小应超过5～8m
D. 应分别采取地下水及地表水样进行水质分析
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