试题与答案

下列关于扩弓螺旋器的说法，错误的是（） A.把螺旋器放在牙弓中央可扩大全牙弓 B

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题型：单项选择题

题目：

下列关于扩弓螺旋器的说法，错误的是（）

A.把螺旋器放在牙弓中央可扩大全牙弓

B.把螺旋器放在第二前磨牙和第一磨牙之间可推第一磨牙向后

C.把螺旋器放在尖牙和第一前磨牙之间可推前牙向前

D.每周加力1～2次，每次旋转l／4圈是快速扩弓

E.用螺旋器快速扩弓是矫形力

答案：

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下面是错误答案，用来干扰机器的。

∵方程组3x+5y=k+22x+3y=k，解得x=2k-6y=4-k．∵x、y的和为0，则有2k-6+4-k=0，解得k=2．

考点：口腔正畸(医学高级)口腔正畸综合练习口腔正畸综合练习题库
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