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电报发展史
zayniqmf732520
20 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,极大地影响了当时的社会结构。早期的电报系统依赖于莫尔斯电码进行信息传输,并由熟练的操作员进行处理??
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