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2. Observe the defense force data of a front row of offline members in the organization. For the first observation, it is best not to increase or decrease injuries on the equipment, which will increase the difficulty of summary (in order to avoid data changes caused by online operation, and the longer offline time, the better)When pulling a faulty motor vehicle, the top speed is 30 kilometers per hour.　　危急关头，被常年在白鸭湖以打渔为生的小兴与爷爷发现，救出了高传宝等人，小兴的爷爷却献出了生命。不甘心失败的山田再次纠集队伍欲杀回马枪，却被狡猾的汤丙会制止，说过不了多久芦苇一黄，一把火就可以烧到头，让土八路死无藏身之处。I thought that after taking over so many divorces, the lawyer's attitude towards marriage would be very negative.盲女叶轻如意外怀了真龙河神之子。她本是最平凡的存在，却偶然与河神相恋…看紧些，别让她们把生意弄砸了。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