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A2.4. 1 Localized neurodermatitis is qualified, and generalized neurodermatitis is qualified after treatment with symptoms disappearing or basically disappearing.Effect after dryingThe 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该剧被称作希区柯克电影《惊魂记》（Psycho）的前传。别人在组团刷副本，你在噼里啪啦地敲着键盘。-Mast lights, 5 nautical miles, but ships less than 20m in length, 3 nautical miles: