(来学网)瓷颈环要求肩台制备的宽度为
  • A.
    (来学网)0.3mm
  • B.
    (来学网)0.5mm
  • C.
    (来学网)0.6mm
  • D.
    (来学网)0.7mm
  • E.
    (来学网)>0.8mm