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1. Download the compression package in Huajun Software Park, decompress it, and then run "JoyToKey.exe"6 p: M # E "w 'l' d3] * L项羽也是忧心忡忡地侍候。His greatest characteristic is "mental retardation". Once in class, the teacher asked us to write a composition. After finishing, Lin Nian asked the teacher, "Teacher, what notebook do you use to write?" The teacher replied, "I will not answer the questions of the mentally retarded." Lin Jialian said, "You are mentally retarded!" It can be seen from this that he is mentally retarded, because he doesn't even know what notebook to use to write his composition, and he also talks indiscriminately regardless of the occasion and object, proving that he has not grown up and has a low IQ.[Investigation] Beibadao Group's Manipulation Reveals Secrets: Artificially Creating "Liquidity Vortex" to Grab Huge ProfitsLiskov 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: