A.
B.
C.
D.
[单选题]A.B.C.D.
[单选题]A.392.33B.192.33C.431.6D.309.7
[单选题]A.3根杆B.4根杆C.5根杆D.6根杆
[单选题]A.mιωB.mωC.D.
[单选题]A.5kN,5kNB.25kN,-5kNC.35kN,-5kND.-25kN,25kN
[单选题]A.(a)B.(b)C.(c)D.均不正确