advance-to return-time ratio
... 急回特性quick-return characteristics 急回系数advance-to return-time ratio 急回运动quick-return motion ...
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对衡量急回运动特性程度的行程速比系数的可能取值范围进行了严密分析；
The possible values of advance-to-return-time ratio, which is used to measure the degree of quick-return for crank-rocker mechanism, are analyzed precisely.
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