同时，给出了真空助力器的特征曲线是如何反映助力器回程速度的方法。
The rules of the last balance position is illuminated, and also the way how does the characteristic curve of the vacuum booster reflect the backing velocity of it is presented.
将滑块最大速度和工作行程回程比作为衡量滑块运动性能的量化指标。
The maximum velocity of the slide and the ratio between working stroke and idle stroke are the important parameters for the slide of a press.
斜面与联接套的齿盘接触可滑动，形成空回程，扭螺丝速度快。
The fluted disc on the connecting sleeve is contacted and glide with the diagonal face to form zero return stroke. The speed of tweaking screws is high.
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