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介紹手機原理和維修技術。現代科技十分的發達，發明了許多電子科技產品，使人類生活更加方便造福了許多人民，而且各種電子商品的更新數度非常的快，像：電腦，相機，手機等尤其是手機，現在通訊技術的普及，讓很多人用上了手機。中國幾乎一班的大中小城市和鄉村都有人使用手機，甚至是多部手機。
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