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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该剧以独特的视角，真实地记录了共和国诞生之初国际国内的历史风云，以1949年新中国成立到1957年社会主义改造基本完成这一特定历史阶段为背景，着重刻画了以毛泽东同志为核心的党的第一代中央领导集体，在新民主主义革命和探索社会主义建设时期，所展现出的政治智慧和领导艺术；同时也描绘出了一幅人民群众紧密团结在党的旗帜下，艰苦奋斗、意气风发，建设新中国、全面开展经济建设的历史长卷。其内容涉及了解放舟山群岛、海南岛、抗美援朝、进疆、进藏，以及中国第一部宪法的制定、毛泽东两次出访苏联等多个观众普遍关注的重大历史事件。葫芦道，周姑娘也没事。Wow Thing 中文字幕 -- 涩琪(Red Velvet) & 信飞(GFriend) & 金请夏 & 全昭妍上季结尾，Ben给Riley策划了一个完美生日，并且排除万难向她表白了爱意。Ben吻了Riley，Riley也接受了。After the screen prompt icon as shown in the figure, the recovery mode entered successfully. After connecting to itunes, you will also be prompted that you have entered recovery mode.真得不能留下……白衣素雅的东方姑娘撑着油纸伞，痴痴的说道。