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219. X.X.30但是，我们医者，无论有多大的把握，都不能这样告诉人。黄豆恍然，将饭菜咽下去，方才对他说道：那是我小葱姐姐师妹。　　江湖风雨，快意恩仇，忠魂虎胆，义烈千秋！尽在《武松》。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 Baidu9.1. 4 After three months of cholecystolithiasis treatment, residual stones and retrogression were found to be qualified after reexamination.她并不知《女诫》内容，只听说是专门教导女子的书，便倍感荣幸，一副憧憬的小模样。