A.急流槽 B.截水溝 C.排水溝 D.盲溝
A.0.5m; B.2m; C.1m; D.0.1m
A.V實(shí)際>V最小 B.V實(shí)際<V最小 C.V容>V實(shí)際>V最小 D.V實(shí)=V計(jì)算