单项选择题
A.1000~1500r/min B.1500~2500r/min C.2500~5000r/min D.5000~10000r/min
A.0.01~0.02mm B.0.02~0.025mm C.0.025~0.04mm D.0.04~0.05mm
A.0.015mm B.0.01mm C.0.005mm D.0.030mm