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电报发展史
mathevzzq533451
3 days ago
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电报出现于19世纪中叶,最初作为一种远距离通信方式,极大地改变了当时的社会面貌。早期的电报系统依赖于莫尔斯信号进行信息传输,并由专业的操作员进行处理??
https://loriscen110555.wikigiogio.com/user
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