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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不知说什么好——下午的时候，他还对小葱说，他不能娶她，要她另择良配呢。对于追加投资的事，我们公司会考虑的。The "Xi Jinping Journal" includes the daily important activities, meetings, speeches, articles, studies, overseas visits, instructions, letters, congratulatory messages, orders, etc. of General Secretary Xi Jinping since the 18th CPC National Congress. Select a date and you can easily query his activities on that day.　　郑建强到机场接了一位酒店的客人，来自美国的华人郭毅然老先生，开车带其去香山某敬老院看望他的“老战友”，这才知道其实去看的正是自己患有老年痴呆症的岳母。临近目的地的盘山路上，因躲避急转弯道后冲出的一辆切诺基而翻下山坡，老先生重伤进了罗晓红所在的医院急救，郑建强也负了重伤。事后才得知，驾驶切诺基的恰恰就是老先生的女儿郭琳琳！1. Soft and comfortable.钟离昧请示道：元帅，怀王从盱眙送来诏命，说齐国高陵君代表齐王请求大楚援救齐国。