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电报的诞生与发展
owainburh616401
25 days ago
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19世纪中叶,帕夫洛夫 的发明改变了人类的通讯方式。最初的电报 是一个复杂而精巧的装置,它利用电流 来传递信息。
https://berthabqkq162283.glifeblog.com/36971805/电报演变
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