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https://blog.wongcw.com/2021/02/22/700mhz%e7%b7%a3%e4%bd%95%e8%a2%ab%e7%a8%b1%e7%82%ba%e9%bb%83%e9%87%91%e9%a0%bb%e6%ae%b5/
700MHz緣何被稱為“黃金頻段”
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