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电报发展史
nellkuod449330
- 2 hours 11 minutes ago
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电报诞生于19世纪中叶,最初作为一类远距离通讯方式,极大地影响了当时的社会结构。最初期的电报系统依赖于电报编码进行信息转换,并由训练有素的操作员进行??
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