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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 BaiduIn many fields, the road to excellence is not the result of accurate calculation of time, but vague and ambiguous. No simple model leads to greatness.唐朝太宗年间，某夜唐太宗梦见身陷险境，幸得一白衣少年所救。徐茂公解梦，显示将有乱事，须得该少年相助平乱。太宗命张士贵往找应梦少年。原来此应梦贤臣乃大将军程咬金之救命恩人薛仁贵，仁贵带着咬金所赠之令箭投军，期间更误堕地洞而得奇遇…岩瀬健（山下智久饰）和吉田礼（長澤まさみ饰）是从小学就在一起玩的青梅竹马，明明对彼此都心存好感，就只差说出“喜欢”二字，可是礼最后怎么就成了多田老师（藤木直人饰）的新娘？What is the significance of calculating panel attack power? That is probably the outfit.你有什么困难，可以来找我。4. Ships engaged in dredging or underwater operations shall display the lights and types specified in subparagraphs (1), (2) and (3) of paragraph 2 of this Article when their maneuvering capability is limited. In addition, when there is an obstacle, it should also be displayed: