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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.该剧是一部不恋爱，是不结婚，非常现实、关于家庭意义的温暖故事。郑氏看着她微微点头。你早点休息。有4个不同极点的轨道是什么？彭城他已经来过很多次了，第一次在这里是景驹、秦嘉的属下，第二次是楚怀王熊心的臣子，很长时间内遭受到项羽的压制。