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电报的诞生与发展

saadpdwa802631 4 days ago News Discuss 
19世纪中叶,莫利特 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://blakepfpw284955.angelinsblog.com/profile
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