A.0.3%
B.0.5%
C.1.0%
D.2.0%
A.0.3%
B.0.5%
C.1.0%
D.2.0%
A.3%
B.5%
C.6%
D.8%
A.3%
B.4%
C.5%
D.6%
A.5%
B.7%
C.8%
D.10%
A.0.2%
B.0.3%
C.0.4%
D.0.5%
A.5%
B.4%
C.6%
D.3%
A.3%
B.5%
C.8%
D.10%
A.需要采取排水措施
B.不需要采取任何措施
C.可设置锯齿形偏沟
D.仅在坡度大于1%时考虑排水
A.二级
B.四级
C.三级
D.五级