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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 BaiduThe ship had traces of being hit, and the paint on its hull actually belonged to the "Changsheng Wheel". The police brought the owner back for interrogation. The owner Wang Mou said that he rented the ship to an Indonesian and a man named Weng Siliang for tens of thousands of dollars.However, the sharp increase in express delivery has produced a large number of discarded packages, which is not a unique phenomenon in China. How do other countries solve the problems brought about by these discarded express packages? Li Li told reporters: "Germany promulgated the Packaging Waste Management Law in 1991, so Japan also has a special Packaging Waste Recycling Law, which stipulates that different packaging wastes should be recycled separately."在20世纪90年代的土耳其，一群十几岁的弃儿组成了乐队，让他们深爱的老师坠入爱河，这样她就有理由和他们呆在一起了。看上去比曾鹏要正气些。《我家的熊孩子》是一档韩国脱口秀节目。节目主要关注家长与孩子之间的问题。你对孩子了解多少？今天孩子和谁见面了，又发生了什么样的故事？孩子今天怎么满面愁容，又为什么食欲突然增加？通过这个节目家长对这些问题会有更深的思考。(2) Equipment, facilities and necessary technical support conditions suitable for the business scope of fire safety assessment;