The line, at which the tooth intersects the graduated cylinder, is an arc in the developed surface of the cylinder.

轮齿与其分度圆柱面的交线在分度圆柱面所展开的矩形中为圆弧；

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The line, at which the tooth intersects the graduated cylinder, is an arc in the developed surface of the cylinder.

轮齿与其分度圆柱面的交线在分度圆柱面所展开的矩形中为圆弧；

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