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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 BaiduA4.1. 2 General inspection items.1. When the motor boat moves to the water, it shall make a long sound at intervals of not more than 2 minutes at a time.Column Introduction: Zhengda Variety Show has a large number of film sources. The film is the eternal brand of Zhengda Variety Show. In the new version of Zhengda Variety Show, the film is still the main section of the column. Therefore, while preserving the original columns such as "The World Is Wonderful", new columns such as "Guinness World Records" and "Action X" have been added. "Zhengda Variety Show" has been the brand column of the channel it broadcasts since its debut, with a very distinctive personality and stable ratings. First broadcast time: 18:00 every Sunday, rebroadcast time: 12:30 every Monday, and 09:30 every Sunday, and solo broadcast channel: CCTV-1最后才问道：李将军，这位蒯彻先生现在何处？如今最重要的事情不是别的，就是打听到这位大才的下落，韩信已经认定他就是自己需要的谋主了。安居招聘新人，陈安琪和张杰伦都来应聘，安琪因为应聘成功很开心，亲了包达仁一口，被前来巡视的马娜娜看到，闹出一场风波。婉君八岁时被卖到周家当冲喜的新娘，虽与伯健有夫妻之名，但婉君在和周家三兄弟相处过程中，渐对叔豪产生好感。宋家是周家的世交，宋家有意将女儿尚琪许配给仲康，仲康自己极为反对。但在家人的逼迫下，同意了婚事，而事后仲康发现自己深爱着婉君，于是毅然退婚，并当众向婉君表明心意，而叔豪也表示同样深爱婉君，这使婉君极为难堪。婉君和仲康在朋友的帮助下私奔未遂，婉君悬梁自尽被叔豪救起。仲康在抗义帝国主义侵略的行动中身受枪伤，幸尚琪细心照料才得以复原，于是仲康决定娶尚琪为妻。但婚后，仲康一直对婉君念念不忘，周母便把婉君赶回娘家。遭舅母百般虐待，婉君的表哥想强暴她，嫣红奋力营救，反遭强暴。婉君和嫣红逃出家门，跑到外面卖东西维生，却遭到旁人的歧视，最后在仲康的百般请求下，婉君答应到周家并与伯健夫妻重聚，叔豪也娶湖南苗族少女为妻，全家满堂谐喜。