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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　　第一天上学，清优因跳错车而结识了同班同学佑和。没过多长时间，老师和同学就觉察出二人关系微妙。老师遂请家长到学校，清优大伯在学校见到佑和母亲后不禁大吃一惊，原来佑和的母亲竟然是自己十六年前在云南插队落户时的前女友，而佑和Tutorial File Download:红椒道：爷爷。Stocks have double-click and double-kill, as do investors themselves. Many unknown people rely on the classic record of a certain year or a certain year, and their performance has soared and their popularity has soared. This is actually a double-click process. This is undoubtedly a lucky good thing in itself, but if you are praised for kidnapping, you will only cheat yourself in the end, and then bitter double killings are almost inevitable. There are not many fresh passages in the investment plot, and the main characters are changed frequently. An iron law in the business world is that there must be high barriers to excess returns. This bumpy truth will not change because we invest in stocks or because we choose different investment styles.Immerse the medicine part into drinking water, stir, normally stand at room temperature for 1-2 hours, filter and boil. If the quantity does not meet the requirements, immerse the filter in a proper amount of boiling water, press slightly, and mix the obtained liquid with the previous liquid.4 View Events