单项选择题
A.1~2min B.2~3min C.3~5min D.5~8min
A.0.3mm/min B.0.5mm/min C.0.8mm/min D.1.0mm/min
A.小于0.01mm/min B.小于0.02mm/min C.大于0.01mm/min D.大于0.02mm/min
A.0.001mm B.0.002mm C.0.003mm D.0.005mm
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