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請依照題意繪出線路圖。
Sep 22nd 2013, 16:40

請依照題意繪出線路圖。
題目:有兩只電燈,當切換三路開關時兩燈交替明滅,當單路開關被投入時,不論三路開關切換至何處,兩燈永遠明亮。
材料:三路開關1個,單路開關1個,電燈2個。

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