(来学网)前牙金瓷冠邻面龈下肩台的宽度约为
  • A.
    (来学网)0.2mm
  • B.
    (来学网)0.5mm
  • C.
    (来学网)0.7mm
  • D.
    (来学网)1.0mm
  • E.
    (来学网)1.2mm