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所以也就顾不得许多，尹旭拿出所有的看家本领。1. How to Use-Launch: Enter Google Earth software and press ctrl\ alt\ a on the keyboard (press at the same time)　　时光流转，经年更迭……他本就生得俊，换上常服，更是翩翩好儿郎，正符合大家心目中的玄武公年轻形象——听说今日玄武公是微服来周家拜访的，谁肯信他只是玄武公的亲卫头领？当下含情注视的，遗留帕子荷包的，不知几许。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 BaiduOperating system Win2000, XP Win2000, XP so, completely move!吕馨眼睛愣愣的看着陈启，然后唰的一下，脸蛋骤然红了。