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5G 牌照發了,2G 和3G 將何去何從? https://blog.wongcw.com/2019/07/04/5g-%e7%89%8c%e7%85%a7%e7%99%bc%e4%ba%86%ef%bc%8c2g-%e5%92%8c3g-%e5%b0%87%e4%bd%95%e5%8e%bb%e4%bd%95%e5%be%9e%ef%bc%9f/