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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:Setting position, system form (wet type, dry type, pre-action, open type, closed type, etc.), alarm valve position and quantity, water pump adapter position and quantity, and whether there is any roof fire water tank connected with this system and automatic sprinkler system diagram.Australia: 60,000若不趁着两家长辈都在京城把亲事给办了，回西南再成亲的话，那就更折腾了。The last Dragonball finally arrived.4.7. We artificially imitated the master master server downtime:Imitation NBA rubber ball: This kind of ball is of average quality, but the price is relatively cheap. It is bought by some people who don't know much about basketball and looks brighter than the original one.