一般施工现场排水沟的横断面和纵向坡度不宜小于()。
A.0.4m×0.4m,0.2%
B.0.5m×0.5m,0.1%
C.0.5m×0.5m,0.2%
D.0.4m×0.4m,0.1%
正确答案:C
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