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电报的诞生与发展
saadgogc094146
4 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://amielhfl991684.blog5star.com/38688907/电报的诞生与发展
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