单项选择题
A.中细砂层B.坍墙掉块C.一般砂砾地层D.漏水地层
A.< 30ml∕30min 和< 4mmB.20~30ml∕30min 和2~4mmC.< 20ml∕30min 和< 2mmD.< 20ml∕30min 和< 3mm
A.1.15~1.20B.1.20~1.25C.1.25~1.30D.0~1.15
A.125mlB.100mlC.75mlD.50ml
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