单项选择题

4.粗加工和半精加工时余量大约设置为（）？
A. 0.1mm, 0.1mm  B. 0.5mm, 0.1mm C. 0.1mm, 0.5mm D. 0.5mm, 0.5mm
A、 A. 0.1mm, 0.1mm
B、B. 0.5mm, 0.1mm
C、C. 0.1mm, 0.5mm
D、D. 0.5mm, 0.5mm

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