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300多元的锂电池焊点打磨机，拆解后只有4个元件，看看你能制作么
上一期实验很好用的焊点打磨机，很多朋友要求拆解看下内部结构，其实内部很简单只有4个元件组成，包括整流元件、电机、联轴器、打磨砂轮，看看能能否制作一个
家用常见常用小电器维修合集122/305
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