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电报发展史
diegomsgy127232
- 2 hours 21 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通讯方式,极大地改变了当时的社会面貌。早期电报系统依赖于莫尔斯电码进行信息编码,并由训练有素的操作员进??
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