A.可采用草皮護(hù)底 B.下游增加消能裝置 C.下游筑攔砂壩 D.可用漿砌片石護(hù)底
A.0.4mm B.0.6mm C.1mm D.1~2mm
A.<15% B.<18% C.18%~25% D.≤25%