A.60kN,40kN,-25kN B.60kN,40kN,25kN C.-60kN,-40kN,25kN D.-60kN,-40kN,-25kN

A.60kN,40kN,-25kN B.60kN,40kN,25kN C.-60kN,-40kN,25kN D.-60kN,-40kN,-25kN

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A.a=1,b=0 B.a=0,b为任意常数 C.a=0,b=0 D.a=1,b为任意常数

A.a=1,b=0 B.a=0,b为任意常数 C.a=0,b=0 D.a=1,b为任意常数

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