(来学网)镜架在外表面允许的坑的直径是
  • A.
    (来学网)ф0.7mm
  • B.
    (来学网)ф0.6mm
  • C.
    (来学网)ф0.8mm
  • D.
    (来学网)ф0.5mm
  • E.
    (来学网)ф0.9mm