前磨牙铸造(来学网)支托的宽度是
  • A.
    (来学网)颊舌径的1/3
  • B.
    (来学网)颊舌径的2/3
  • C.
    (来学网)颊舌径的1/2
  • D.
    (来学网)颊舌径的1/4
  • E.
    (来学网)颊舌径的4/5