【单选题】【消耗次数：1】
切削用量是指（?? ）。
①
切削速度
②
进给量
③
切削深度
④
三者都是
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相关题目
【单选题】
切削用量三要素对刀具耐用度的影响程度为（ C ）。
①
背吃刀量最大，进给量次之，切削速度最小
②
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③
切削速度最大，进给量次之，背吃刀量最小
④
切削速度最大，背吃刀量次之，进给量最小
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