A.
B.
C.
D.
[单选题]A.c>0B.0<λ<1C.c=1-λD.
[单选题]A.B.C.D.
[单选题]( )。A.B.C.D.
[单选题]A.2/3B.7/9C.20/21D.9/14E.1/2
[判断题]A.对B.错
[单选题]A.9.6kPaB.10.01kPaC.9.24kPaD.53.87kPa