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The reason most electrical plug prongs have holes in them

Nguồn Engadget 科技1 ngày trước
Tóm tắt nội dung

If you've ever looked at the end of a plug, you've probably wondered why some have holes, and some don't - and no, it's not actually a big conspiracy theory.

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The reason most electrical plug prongs have holes in them · Hoàn Vũ Thông Giám