(来学网)上颌第二前磨牙分成两根的占
  • A.
    (来学网)35%
  • B.
    (来学网)50%
  • C.
    (来学网)60%
  • D.
    (来学网)80%
  • E.
    (来学网)90%
正确答案:
A