【单选题】【消耗次数：1】
在机械加工工艺过程中安排零件表面加工顺序时，时效处理应安排在（）。
①
精加工之后
②
精加工之前
③
粗加工之后
④
粗加工之前
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相关题目
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在机械加工工艺过程中安排零件表面加工顺序时，要“基准先行”的目的是（）。
①
避免孔加工时轴线偏斜
②
避免加工表面产生加工硬化
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消除工件残余应力
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使后续工序有精确的定位基面
【单选题】
在机械加工工艺过程中安排零件表面加工顺序时，要“基准先行”的目的是（）
①
避免孔加工时轴线偏斜
②
避免加工表面产生加工硬化
③
消除工件残余应力
④
使后续工序有精确的定位基面
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