The stability of feed system was analysed importantly, equivalent rigidity and critical creeping speed of XH715 feed system was calculated, the cause of using paste to mould rail was put forward.

重点分析了进给系统的稳定性，计算出进给系统的等效刚度和临界爬行速度，给出了采用贴塑导轨的原因。

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Thus, in the past quarter Dell has been sitting on 18 days' sales, and the figure is creeping up as the speed of production increases.

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