A.明渠導流 B.涵管導流 C.隧洞導流 D.渡槽導流
A.羊腳碾 B.汽胎碾 C.振動碾 D.夯土機
A.H>5m,R<75mm B.H>5m,R>75mm C.H<5m,R<75mm D.H<5m,R>75mm