题目内容

以下关于钉洞固位形的说法中错误的是()

A. 钉固位力的大小主要取决于钉洞深度
B. 固位钉的直径约为1mm
C. 固位钉可分为粘固式、螺纹式、楔入式
D. 楔入式固位力最好
E. 钉洞应位于坚固的牙本质上

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