题目：
做嵌体牙体预备时，错误的做法是（）
A．去尽病变腐质
B．轴面最大周径线降至龈缘
C．提供良好的固位形和抗力形
D．适当磨改异常的对颌牙
E．预防性扩展
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
做嵌体牙体预备时，错误的做法是（）A．去尽病变腐质 B．轴面最大周径线降至龈缘 C．
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