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【单选题】
用φ10高速钢键槽铣刀粗加工45钢键槽时,切削深度为3mm,切宽10mm,主轴转速600r/min,选择合适的进给速度( )。A.
10mm/min
B.
20mm/min
C.
50mm/min
D.
200mm/min
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