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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.她在这边也告诉姐姐缘故，务必不能让爹娘知道这件事，免得露陷了。轻声嘱托：《望夕图》在吊床上，我不是很满意。　　第二次世界大战中期,美军参战令希特勒一统世界的狂梦破碎。1942年1月20日一场秘密会议,全世界人类的生活就此改变.这场会议中的一份文件,隐藏了多少秘密,犹太人是生是死,答案只有秘密对话里的发言者知道……英布如果有想要扩大九江国的意思，但是西面是他的老丈人，北面是我们，南方是好当的彭蠡泽聊斋2有6个系列，《义犬》林静,陈浩民主演、《婴宁》六月,赵毅主演、《胭脂》韩雪,严宽主演、《罗刹海市》叶璇,孙耀威主演、《莲香》杨雪主演。Density (g/cm3)