A.3.33g
B.1.62g
C.0.39g
D.3.50g
[单选题]A.仅适用于层流区B.仅适用于光滑区C.仅适用于过渡区D.紊流光滑区、过渡区、粗糙区均近似可用
[判断题]A.对B.错
[单选题]A.B.C.D.
[单选题]A.144mmB.128mmC.6mmD.5mm
[单选题]A.60%B.65%C.70%D.72%
[单选题]A.600PaB.900PaC.1200PaD.2400Pa