The unloading curve normally falls below the loading curve to form a hysteresis loop .

卸载曲线通常都落在加载曲线之下，形成一个滞后回线。

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The loading curves of coal-rock combination body are usually not coincidence with the unloading curves. In addition, they usually do not form a closed loop.

同一循环中的加载与卸载曲线基本不重合，且多数情况不形成闭合环路；

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Through comparison, a scheme of "ac generating, DC energy feedback" electr IC clo sed loop transmission loading test bench is suggested and the hardware diagrams and work principle are presented.

通过比较提出了“交流发电、直流能量反馈”电封闭式变速器加载试验台方案，给出了硬件结构图，介绍了工作原理。

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