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【单选题】
平截面假设说的是( )。A.
要轴力大小相等，杆端加力的方式不同，一般只对杆端附近区域的应力分布有影响，受影响的区域长度不超过杆件的横向尺寸。
B.
形前原为平面的横截面，变形后仍保持为平面。
C.
件在卸载的过程中应力与应变呈直线关系。
D.
件在第二次加载的情况下，其比例极限有所提高，断面伸长率有所降低。
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A.
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B.
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D.
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sense
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