(来学网)绞釉位于釉质( )
  • A.
    (来学网)近表面1/3
  • B.
    (来学网)近表面2/3
  • C.
    (来学网)近釉质牙本质界1/2
  • D.
    (来学网)近釉质牙本质界2/3
  • E.
    (来学网)近釉质牙本质界1/3