【单选题】【消耗次数：1】
精基准是用（ ）作为定位基准面。
①
未加工表面
②
复杂表面
③
切削量小的
④
加工后的表面
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当工件以某一已加工表面定位可以比较方便地加工出其余各表面时，应尽可能选择该已加工表面作为统一的精基准来加工出工件上的多个表面，该原则称为（ ）
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②
Certainly
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I’m sorry to hear that
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