圆锥形套筒冠内、外冠(来学网)面间歇为
  • A.
    (来学网)0.2mm
  • B.
    (来学网)0.3mm
  • C.
    (来学网)0.5mm
  • D.
    (来学网)0.7mm
  • E.
    (来学网)1mm