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? ? Distance.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　　无尽之中，我们被一个女人温柔的声音引导着整个世界。那是一种神话般的声音，一首Scheherazade给我们讲述了人类生活和奋斗的永恒故事：“我看到一个孩子在雨下走着去参加生日聚会……”“我看到一个还没有找到爱的男孩……”“我看到一个不再信任银行的男人……”我们从一系列显而易见的琐碎瞬间，看到男人和生活的平凡和宏伟，这些琐碎的时刻反映了生活的辉煌：一个女孩第一次握住一个心爱的男孩的手；一个父亲在倾盆大雨中系住他女儿的鞋带；一个年轻的女人等待她的ap。点睛之笔——但也包括人类残忍表现在平庸中的时刻——一个人拖着十字架；一个残废的战争老兵坐在路边；一个父亲把死去的儿子抱在怀里——就像生命的号角一样，关于永无尽头，向我们展示了祢的宝贵和美丽。R存在，唤醒我们希望保持这永恒的宝藏并传递它。Fifty-first fire technical service institutions in violation of the provisions of the act, causing losses to others, shall be liable for compensation according to law; If the repaired and maintained building fire-fighting facilities cannot operate normally and fail to play their due role in the event of a fire, resulting in increased casualties and losses, they shall be given a heavier punishment. If a crime is constituted, criminal responsibility shall be investigated according to law.The main contents of this program:----