单项选择题
一般排水沟的横断面和纵向坡度不宜小于（）。
A.0.4m×0.4m，0.1%
B.0.5m×0.5m，0.1%
C.0.4m×0.4m，0.2%
D.0.5m×0.5m，0.2%
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单项选择题
A.0.4m×0.4m，0.1%
B.0.5m×0.5m，0.1%
C.0.4m×0.4m，0.2%
D.0.5m×0.5m，0.2%
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