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Almost all cellular phones must support multi-frequency and multi-radio. The spectrum allocation for global wireless communications has been redefined or redefined by relevant authorities. From a historical point of view, spectrum allocation has always been dominated by various countries, so it is not consistent in the world, because they are usually controlled by local governments. Unfortunately, the adjustment of spectrum is driven by the economies of scale of the industry, not by foresight in the field or cooperation between relevant institutions around the world. Without spectrum comparison, it is difficult to realize equipment standardization. As the wireless communication industry continues to allocate spectrum, it is foreseeable that different frequency bands will still follow localization requirements in the future instead of being optimized for global needs.　　弗拉纳甘重写剧本，此前由Akiva Goldsman改编。杨长帆喘着粗气道，倭寇来了……老丁闻言眼睛一瞪，腿也软了下来。CBS All Access宣布续订《星际迷航：皮卡德》第二季。呦呵，还挺给老杨面子？中举的人果然不一般，这帮兵痞都得注意点。Is there only one entry in the loop5.3. 1 PCB design must follow the requirements of "PCB Process Design Specification";