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【单选题】
在圆截面折杆abcdef的端部受到一对集中力P的作用(如图所示)分析折杆中这时处于弯曲与扭转组合变形状态的杆段,其结果应当是( )。A.
mg src="http://p.ananas.chaoxing.com/star3/origin/be111a6cff476afc2dc5483d86cc863c.png">
B.
只有ab段和ef段
C.
只有cd段;
D.
只有bc段、cd段和de段
E.
没有。
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B.
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C.
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A.
正确
B.
错误
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