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【单选题】
有一受轴向载荷的紧螺栓连接,所受的预紧力 F0 = 6000N ,工作时所受轴向工作载荷 F = 3000N ,螺栓的相对刚度 = 0.2 ,则该螺栓所受的总拉力 F2 = _____________N 。A.
7500
B.
4200
C.
9000
D.
6600
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