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(2006)如图所示,直杆受扭转力偶作用,在截面1—1和2—2处的扭矩为:
A.5kN·m,5kN·m
B.25kN·m,-5kN·m
C.35kN·m,-5kN·m
D.-25kN·m,25kN·m
参考答案:B
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