A.0.02mm B.0.015mm C.0.01mm
A.1/4轉(zhuǎn)和1/2轉(zhuǎn) B.1/4轉(zhuǎn)和1/3轉(zhuǎn) C.1/3轉(zhuǎn)和1/2轉(zhuǎn)