题目内容：
I度开合指上下前牙切端垂直向间隙在（）
A.1mm以内
B.2mm以内
C.2mm以内
D.4mm以内
参考答案：
选择题：I度开合指上下前牙切端垂直向间隙在（）
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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