(来学网)上中切牙近中唇面距离切牙乳头的距离是
  • A.
    (来学网)3~4mm
  • B.
    (来学网)5~6mm
  • C.
    (来学网)6~8mm
  • D.
    (来学网)8~10mm
  • E.
    (来学网)12mm
正确答案:
D