题目内容：
一对渐开线直齿圆柱齿轮的啮合线相切于（）。
A.两分度圆
B.两基圆
C.两齿根圆
D.两节圆
参考答案：【答案仅供学习，请勿对照自行用药等】
选择题：一对渐开线直齿圆柱齿轮的啮合线相切于（）。
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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