单选题:新奥法施工中,当(  )稳定后,修筑防水层和第二次衬砌。

题目内容:
新奥法施工中,当(  )稳定后,修筑防水层和第二次衬砌。 A.围岩稳定
B.围岩充分稳定
C.地下水流干
D.第一层衬砌变形
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