题目内容

放水孔终孔孔径不大于58毫米,观测孔终孔孔径不小于50毫米,套管不小于二级,末级套管尽量靠近含水层,套管壁厚不小于5毫米,水门要安设在末级套管上,其承受压力不小于孔口压力的()倍。

A. 1.5
B. 2
C. 2.5
D. 3

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