在其他条件不变时,若受轴向拉伸的杆件横截面面积增加一倍,则杆件横截面上的正应力A...

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【单选题】

在其他条件不变时,若受轴向拉伸的杆件横截面面积增加一倍,则杆件横截面上的正应力

4 倍

2 倍

1/2 倍

1/4 倍

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