... geometrical light-path ==> 几何光路 geometrical mean pitch ==> 几何平均螺距 geometrical mean radius ==> 几何平均半径 ...
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mean geometrical pitch 平均几何螺距
The limit pressure angle is related to such factors as offset angle, mean spiral angle, pitch cone angle and mean pitch cone diameter, not to geometrical shape of the tooth surface.
极限压力角受偏置角、大小轮的螺旋角、节锥角和中点的分度圆直径影响，而与齿面的其他参数无关等结论。
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