单选题:杆形卡环与圆环形卡环相比较主要不足是(  )。

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题目内容:
杆形卡环与圆环形卡环相比较主要不足是(  )。 A.支持作用差
B.稳定作用差
C.固位作用差
D.弹性作用差
E.对基牙损伤大
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