【单选题】
___是指杆件在外力作用下发生变形，外力卸除后能完全恢复的变形。
A. 弹性变形
B. 塑性变形
C. 弹塑性变形
D. 以上都不对
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答案
A
解析
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【单选题】
两截面相同，材料不同的拉杆，受到相同的轴力作用时则其___。
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两截面不同，材料相同的拉杆，受到相同的轴力作用时则其___。
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C. 为了保证拉压杆不致因稳定性不足而破坏
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