We have seen in the market most of the magnetizing cup with magnets, plus or minus pole points.
咱们在市场上所见到的磁化杯大多采用一般磁铁，正负极不分。
Linking method: Connect the electric needle instrument of plus or minus pole respectively on the needle handle, and exchange poles every time.
连接方法：将电针仪的正负极分别接在针柄上，每次将正负极交换连接。
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