题目内容

在渗流破坏的防治措施中，下列哪个措施不能起到降低水力坡度的效果？

A. 上游做垂直防渗帷幕或设水平防渗措施
B. 下游挖减压沟
C. 在弱透水层上加盖重，增加弱透水层厚度
D. 溢出部位铺设反滤层

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