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Tooth profile deviation; Effective length; Initial point; End point;
齿廓偏差；有效长度； 起测点；终测点；
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Pitch Point is the intersection of the spline tooth profile with the pitch circle.
节点是键齿的齿廓与节圆的交点。
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Pitch Point is the intersection of the spline tooth profile with the pitch circle.
节点是键齿的齿廓与节圆的交点。
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