未剪腳的led燈珠，那支腳是正極？那支腳是負極？ #小妙招
Synopsis
LED燈珠有區分正負極，如果拿到全新尚未剪腳的LED燈珠，如何確認那支腳是正極？那支腳是負極？宅爸詹姆士告訴你。 對這個鉗 ...
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