问题 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%

答案

参考答案:D

不定项选择
单项选择题 案例分析题