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电报历史
junaidnvxg615951
2 days ago
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电报出现于19世纪中叶,最初作为一类远距离通信方式,极大地改变了当时的社会格局。早期的电报系统依赖于莫尔斯信号进行信息传输,并由训练有素的操作员进行??
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