A.2.5kN·m,3kN·m B.-2.5kN·m,-3kN·m C.-2.5kN·m,3kN·m D.2.5kN·m,-3kN·m

A.2.5kN·m,3kN·m B.-2.5kN·m,-3kN·m C.-2.5kN·m,3kN·m D.2.5kN·m,-3kN·m

查看答案