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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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