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["【Ежедный_вопрос_день_1156вопрос】с119года6мая5дня", "Этотпостпоследед1Голубаятюльан" /Edit

2019-06-05View Original

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本帖最后由 绿莲花 于 2019-6-6 23:17 编辑 【每日一题 第156题】2019年6月5日 交流电的频率是50Hz,则该电流的方向每秒改变50次。 判断题() 请在两日内作答。

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