A.
B.
C.
D.
[单选题]是( )A.B.C.D.
[单选题]A.19B.24C.29D.36
[单选题]A.3kPaB.23.5kPaC.102.4kPaD.123.5kPa
[单选题]A.B.C.D.
[单选题]A.0.21m/sB.0.115m/sC.0.105m/sD.0.0525m/s