单项选择题
在一般砂砾石地质条件下施工时,造孔泥浆的失水量和泥饼厚应该为()。
A.< 30ml∕30min 和< 4mm
B.20~30ml∕30min 和2~4mm
C.< 20ml∕30min 和< 2mm
D.< 20ml∕30min 和< 3mm
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单项选择题
A.< 30ml∕30min 和< 4mm
B.20~30ml∕30min 和2~4mm
C.< 20ml∕30min 和< 2mm
D.< 20ml∕30min 和< 3mm
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