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![Radio - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_30.jpeg)
Radio - Wikipedia, the free encyclopedia
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日期:2024-07-07
Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 3 kHz to 300 GHz. These ......看更多