单项选择题
A.加快 B.减慢 C.不变
A.0.8mm B.1.0mm C.1.2mm D.1.6mm
A.转速快些，进给量大些 B.转速慢些，进给量小些 C.转速快些，进给量小些 D.转速慢些，进给量大些
A.6 B.5 C.7 D.9
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