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The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From BaiduApple mobile phone Internet access parameter setting method: you enter the mobile phone menu, select "Settings"-"General"-"Cellular Mobile Network"-"Cellular Mobile Data Network" in turn, and enter "CMNET" at the APN of cellular data; Other items need not be filled in or changed. After the setup is successful, turn off the mobile phone and restart it. Warm Tip: If the mobile data traffic package you are using only includes traffic from cmwap access points, change the APN to "cmwap". Please refer to.张槐狐疑万分，这么丑的女子，怎么菊花说她美呢？见礼完毕，早有人摆上茶果，大家说笑吃茶。是啊，几个月制作出来的游戏，连收费都不敢收费。Together with a group of friends, Hanne Mette viditint the abandoned ski, Svartsjön as Hannes boyfriend, Johan, are planning to buy and reopen. The site, which lies far in the Swedish wilderness, has stood completely empty and abandoned since a gruesome murder case 20 years earlier.今日寡人回来省亲，大家都随意些。一个神经质有躁郁症的CIA女特工凯莉，一个被基地组织囚禁8年后被解救回美国但疑似已被策反的大兵布洛迪，两个性格不讨好、样子不偶像的角色，成为艾美奖、金球奖最佳剧集《国土安全》的灵魂人物。在第一季中，所有人都觉得这场猫捉老鼠的游戏中，凯莉已经陷入万劫不复之地。没想到第二季播完之后，“没啥理由能活下去”的人变成了布洛迪。第一季疑云丛生，第二季变本加厉，每隔两三集都会有个剧情大突破。