(来学网)适用于牙冠短、相邻两牙有自然间隙的游离端缺失修复的固位体是
  • A.
    (来学网)杆式卡环
  • B.
    (来学网)环形卡环
  • C.
    (来学网)应力中断式卡环
  • D.
    (来学网)联合卡环
  • E.
    (来学网)RPI卡环