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MindManager Installation Steps往后晚辈定会记着秦大夫教导，不去欺人。友達登録 深田恭子 山口リエThe sensitivity to be used can be selected according to the shooting scene.　　焦急的刘文庆尴尬地发现林星的身边竞多了一个自称是林星男朋友的吴晓，吴晓在宴会上不俗的表现，令林星兴奋。当林星想为此答谢的时候，吴晓也提出了一个更加荒唐的要求……Name: JaydenThe 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 Baidu