(来学网)用于向缺隙方向倾斜基牙的卡环是
  • A.
    (来学网)Ⅰ型卡环
  • B.
    (来学网)Ⅱ型卡环
  • C.
    (来学网)Ⅲ型卡臂
  • D.
    (来学网)A和B均可
  • E.
    (来学网)A和C均可