题目内容
（请给出正确答案）
[主观题]
为改善材料切削性能而进行的热处理工序（如退火、正火等），通常安排在 进行。 The process of heat treatment （such as annealing, normalizing, etc.) to improve the cutting performance of a material is usually scheduled to be carried out .
A、切削加工之前 Before cutting
B、磨削加工之前 Before grinding
C、切削加工之后 After cutting
D、粗加工后、精加工前 After coarse machining, and before fine machining
提问人：网友comebaker
发布时间：2022-01-07
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