单选题:涵洞施工宜在枯水季节进行,施工前须在施工范围两端河道或泄道上筑坝阻水,坝顶比施工期间可能出现的最高水位至少要高出(  )

题目内容:
涵洞施工宜在枯水季节进行,施工前须在施工范围两端河道或泄道上筑坝阻水,坝顶比施工期间可能出现的最高水位至少要高出(  )m,以防淹没。 A.0.5~0.8
B.0.5~1
C.0.5~1.5
D.0.5~1.8

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