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The whole network of "Learning Power" has more than 180 first-class columns in 17 sections, including "Learning New Ideas", "Xi Jinping Wenhui", "Learning Culture", "Global Vision" and "Learning Massive Open Online Course". The content is extremely rich and a large number of free-to-read news, periodicals, ancient books, open classes, songs, operas, movies, books and other materials are gathered.回到玄武王府，等没外人的时候，小葱才问道：娘，今日镇国公夫人都跟你说什么了？郑氏听了，回想起来，先轻笑一会，然后道：这可是奇事……遂把当时经过说了，惊得小葱目瞪口呆。Private int num2;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项羽点头道：是啊，如今总算是妥善解决了，我们就能腾出手来对付刘邦了。4. The result of the conversation is not important, but the atmosphere of the process is very important.到集上你看中了啥东西，表哥就帮你买啥东西。