单项选择题
A、0.030~0.105mm B、0.025~0.037mm C、0.010~0.069m D、0.037~0.051mm
A、30%~50% B、40%~60% C、50%~80% D、80%~90%
A、0.04mm B、0.01mm C、0.02mm D、0.05mm