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在轴向受压构件中，用圆形截面也是合理的。
The circle section is rather reasonable for axial compressed member.
建立了描述淬火钢圆形截面硬度分布曲线——U曲线的解析函数表达式。
An analytical function for describing hardness distribution in round section of quenched steel, known as U-curve, has been established.
通过对圆形截面工件的分析，得出圆形截面工件的积分限。并做了程序设计。
By analyzing round section, the reasoning out process and conclusion on integral limit of round section and a correction computer program are presented.
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