(来学网)烤瓷熔附金属全冠在前牙切端至少应预备
  • A.
    (来学网)0.5~1.0mm
  • B.
    (来学网)1.0~1.5mm
  • C.
    (来学网)2mm
  • D.
    (来学网)2.5mm
  • E.
    (来学网)3mm
正确答案:
C