【单选题】【消耗次数：1】
范成法是利用（ ）齿轮互相啮合时其共轭齿廓互为包络线的原理来切齿的
①
两个
②
一个
③
多个
④
一对
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用范成法加工出的齿廓是刀具齿刃的共轭齿廓，被加工的齿轮与刀具的模数、压力角（ )长度，故用同一把刀具可切制出各种齿数的齿轮，精度较高（可加工8级或8级以上精度的齿轮）
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