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Liaoning ProvinceDecoration pattern:少爷今天没心情画画，拿几袋垃圾给他们去？唐伯虎表情不变，双眼紧盯着鸡翅膀，非常小心细致的刷着酱油。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 Baidu项声眼睁睁地看着，龙且陷入绝境之中。16.7 Olfactory loss is unqualified.Symantec AntiVirus 10. X Corporate Edition (SAV) entered EOSL (End of Life Support) on 4 July 2012. Relevant virus definition library updates, maintenance updates and technical support are no longer provided. It is recommended to replace SAV 10. X with Symantec Endpoint Protection 12.1 (SEP 12.1). For more details, please refer to Symantec's official support page. (Sina)