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【单选题】
D-043 变截面钢轴如图。已知T 1 =2kN·m,T 2 =1kN·m,G=80GPa, 则A、B两截面间相对扭转角 φ AB 的值为______。
A.
0.21°
B.
0.42°
C.
0.84°
D.
1.26°
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