(来学网)支托的宽度应是
  • A.
    (来学网)面颊舌径的1/2
  • B.
    (来学网)面颊舌径的1/3
  • C.
    (来学网)面近远中径的1/4
  • D.
    (来学网)面近远中径的1/2
  • E.
    (来学网)面颊舌径的1/4