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"It's coming! Huawei 5G mobile phone! The reporter measured the download speed. Who is in charge of ups and downs in 5G era?" On the afternoon of 26th, Huawei released its first 5G mobile phone in the Chinese market! How fast is 5G mobile phone? What changes can it bring to our life? (CCTV Finance and Economics)　　梁山伯出身平民，家道中落，幼时父亲因治水身亡，由母亲抚养成人。他性格耿直，憨厚笃诚，一心继承父志，经世济人。在去杭州尼山书院的路上遇到女扮男装的祝英台，两人意气相投，结为异姓金兰。在书院三载，又与英台“日同桌，晚同床”，相互照应，情深义厚。　　気付くとそこは、空の上に浮かぶ石の迷路があったり、ポケモンが大きくなったりする、とっても不思議な場所。周菡神情落寞地道：怎么不会？你听那些人说的话，想必他平日里架子大的很。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.王家有王翦、王贲父子在灭六国之战中，功劳显赫。汉王已经意识到你的不凡之处，特意让我来找你回去的。