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电报发展史
harmonyjghr410715
1 hour 16 minutes 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面貌。早期电报系统依赖于莫尔斯信号进行信息传输,并由熟练的操作员进??
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