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电报历史
lawsonsoyu423115
20 hours ago
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电报出现于19世纪中叶,最初作为一种类的远距离信息传递方式,极大地影响了当时的社会结构。早期的电报系统依赖于莫尔斯信号进行信息编码,并由专业的操作员??
https://faylfeg072649.livebloggs.com/profile
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