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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.嗯，那地方是有点难找。不对啊。停了一下，又郑重问道：那少爷说，住皇城好不好？她一会姑娘一会少爷的。Fox宣布拍摄柯南·道尔与胡迪尼的迷你剧十六年前，华心育儿院的雪花、浪花、火花和烟花四位小朋友，各有音乐才华，彼此呵护，被称为华心四朵花。十五岁的雪花，被旅居海外的姨妈接走。接着，火花被叶家收养，浪花和烟花被白家收养，华心四朵花被迫分离。十六年后，火花为了寻访雪花的下落，进入法国东方艺术学院进修小提琴，与校园王子齐飞相恋。十六年后，浪花以护士身份入住耿家"风雨园"，成为耿克毅的特别护士。耿克毅的独子耿若尘，是个历经沧桑的浪子。海华在父子二人间，扮演了亲情使者，也让自己陷进了情网。十六年后的烟花，从小被海华细心的呵护，性格阳光，被同事徐浩与韩力同时追求，上演了一出啼笑皆非的生活趣事。Define a factory interface. Q: How will it be realized? A: Declare a factory abstract class