A.只與雷諾數(shù)Re有關(guān) B.與管壁相對粗糙度k/d有關(guān) C.與Re及k/d有關(guān) D.與Re和管長,有關(guān)
A.8 B.4 C.16 D.10
A.1.82×10-3 B.1.63×10-3 C.1.54×10-3 D.1.72×10-3