题目内容：
一对直齿圆柱齿轮的中心距（）等于两节圆半径之和。
A.一定
B.不一定
C.一定不
D.不确定
参考答案：
选择题：一对直齿圆柱齿轮的中心距（）等于两节圆半径之和。
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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