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【单选题】
以下关于杆件变形形式描述 有误 的是( )A.
轴向拉伸或压缩变形是指轴向伸长或缩短的变形
B.
圆轴扭转变形是指物体受到外载荷作用时横截面发生绕着轴线方向的扭曲变形
C.
平面弯曲变形是指物体在外载荷作用下轴线变弯的变形
D.
平面弯曲变形是指问题在外载荷作用下横截面变弯的变形
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