Article
線圈直重要 - The Importance of Coils

Subject matters: 新知 - new knowledge,
Language level: Baihua

Keywords: science, general knowledge,

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Article
世界最大長波電台 - The Biggest Longwave Transmitters in the World

Subject matters: 新知 - new knowledge,
Language level: Baihua

Keywords: radiocommunication, science, general knowledge,

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