A.1 B.[1.75,2.0] C.1.75 D.2.0
A.謝才系數(shù) B.雷諾數(shù) C.相對(duì)光滑度 D.相對(duì)粗糙度
A.1 B.1.75 C.2.0 D.(1.75,2.0)