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本帖最后由泡沫_ZPTK 于 2018-1-29 20:16 编辑参与：奖3财富；回答正确：奖10财富；注：48小时内回答正确奖励10财富，此贴有效时间48小时。选择题：一台转速为1475转/分钟的泵、电机为500千瓦，电压10KV 50Hz，其振动的一倍频(也称基频)为(　　)。 A、 25Hz B、 50Hz C、 100Hz D、 200Hz 正确答案：A https://attach01.hcbbs.com/forum/201801/05/235057wnwxbzxb311ikvvz.jpg.thumb.jpg

Reply #22018-01-29

选择题：一台转速为1475转/分钟的泵、电机为500千瓦，电压10KV 50Hz，其振动的一倍频(也称工频)为(　A　)。 A、 25Hz B、 50Hz C、 100Hz D、 200Hz

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