题目内容：
When an induction motor with 10 poles is supplied by 50Hz three-phase ac power source, the synchronous revolutions per minute is __D___. (Synchronous r/min = 120 f/p)
参考答案：
选择题：When an induction motor with 10 poles is supplied
- 题目分类：平顶山学院-大学英语4（高起本）
- 题目类型：选择题
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