A.0
B.
C.π
D.
[单选题]A.320kNB.340kNC.360kND.380kN
[单选题]A.B.C.D.
[单选题]A.0B.C.πD.
[单选题]A.1.5kN·mB.2kN·mC.2.5kN·mD.0kN·m
[单选题]A.2.5kN·m,3kN·mB.-2.5kN·m,-3kN·mC.-2.5kN·m,3kN·mD.2.5kN·m,-3kN·m