開關問題 - 居家修繕

By Connor
at 2020-11-06T18:49
at 2020-11-06T18:49
Table of Contents
今天換開關遇到平常沒想過的問題,
http://i.imgur.com/h9CrFb7.jpg
這個開關就控制一盞燈而已,
為什麼上面0的地方要接兩條火線?
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居家修繕
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