杆形卡环与圆环形卡环相比较主要不足是(  )。

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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Cloning (克隆): Future Perfect?   1.A clone is an exact copy o

Cloning (克隆): Future Perfect?   1.A clone is an exact copy of a plant or animal

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More children will study science if it becomes more attracti

More children will study science if it becomes more attractive.A.Right B.Wrong C

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Hearing problems may be alleviated by changes in diet and ex

Hearing problems may be alleviated by changes in diet and exercise habits.A.remo

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These programmes are of immense value to old people.

These programmes are of immense value to old people.A.natural B.fatal C.tiny D.e

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