A.50kN·m B.100kN·m C.150kN·m D.200kN·

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问题 A.50kN·mB.100kN·mC.150kN·mD.200kN·m

选项 A.50kN·m
B.100kN·m
C.150kN·m
D.200kN·m

答案 D

解析
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