用于相邻两基牙邻(来学网)面有间隙的固位体是
  • A.
    (来学网)圆形卡环
  • B.
    (来学网)回力卡环
  • C.
    (来学网)联合卡环
  • D.
    (来学网)间隙卡环
  • E.
    (来学网)双臂卡环