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电报发展史
brendadfwy370603
- 2 hours 43 minutes ago
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电报起源于19世纪中叶,最初作为一种远距离通讯方式,极大地影响了当时的社会结构。早期电报系统依赖于电报编码进行信息传输,并由训练有素的操作员进行处理??
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