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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:GAYOK BANGKOK系列，这是一部网络连续剧，将以六名居住在曼谷的男同新恋者的生活以及他们的戏剧-关系，职业，家庭以及最重要的新健康状况为背景，以亚洲男同新恋者可以真正与之交往的方式进行首映 2月21日。At that tail of the warhead, the drag armour-piercing firebomb is filled with a drag agent and a fireagent, Under the pressure of propellant propelling warhead, it will spontaneously ignite to produce open flame, So it can break through the oil drum and ignite or detonate the gasoline. However, the old-fashioned traced armour-piercing firebombs have obvious trajectories due to traced light when they are launched. Therefore, it is very easy to expose oneself while pointing targets to friendly forces. Therefore, the new tracer armour-piercing firebombs now equipped all start to burn and emit light only after the projectile flies out of the muzzle for a certain distance (the generally set safe distance is 100 meters, which makes it impossible for the enemy to judge the firing position with tracer ammunition, while targets within 100 meters do not need to be indicated by tracer), The principle is generally to ignite the tracer and combustion agent carried by the projectile by accumulating the heat generated by the warhead's friction with the air after flying for a certain distance to a certain extent.To change these settings, exit the flight simulator and press Ctrl + Alt + A (+ Option + A on the Mac)　　发现赖敏的心愿单后，丁一舟穷追不舍，终得知赖敏患有“企鹅病”，一种发病率仅为十万分之三的绝症。为完成赖敏“环游中国”的心愿，丁一舟骑单车拉轮椅，带她及其爱犬阿宝从柳州出发，踏上“走心”之旅。