A.
B.
C.
D.
[多选题]A.60kNB.100kNC.各级荷载D.总荷载
[单选题]A.B.C.D.
[单选题]A.秩r(A)=lB.秩r(A)=2C.|A|=0D.|A|≠0
[单选题]A.6.0B.8.6C.9.8D.10.5
[单选题]A.平衡力系B.-合力C.一合力偶D.一合力与一合力偶