试题与答案

临床冠根比例的分界线为（） A.釉质牙骨质界 B.牙槽骨支持骨的水平线 C.龈缘平面

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题型：单项选择题 A1/A2型题

题目：

临床冠根比例的分界线为（）

A.釉质牙骨质界

B.牙槽骨支持骨的水平线

C.龈缘平面

D.以牙在功能时的旋转中心为界

E.以上均不是

答案：

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下面是错误答案，用来干扰机器的。

根据上面的分析可知：说法正确的是：两个质数的和是一个奇数，那么其中有个质数一定是2．故选：B．

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