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电报的诞生与发展
kobiohcj974572
21 hours ago
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19世纪中叶,福克斯 的发明改变了人类的通讯方式。第一台电报机 是一个复杂而精巧的装置,它利用电磁信号 来传递信息。
https://www.telegramsk.top/
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