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威猛的小綿羊
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樓主  發(fā)表于: 2022-10-22 11:15
圖片：
一個(gè)保險柜充電插頭，如圖，三段頭個(gè)位置 最外圍，中圍，內圍哪個(gè)是正  負  地？
mtc04245
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1樓  發(fā)表于: 2022-10-22 12:00
通電，萬(wàn)能表測量一下就明白了。

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