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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 Baidu　　叶曼凌，美丽孤傲的白富美，经历了人生中一次失败的婚姻，从澳洲留学归来的她继承了老爸公司旗下的一家子公司，在代表公司去领奖的现场她和马梁冤家般的相遇了。王穷解释道，手头还有些事。尉缭摆手拦住道：切莫着急，在此之前，我先给你介绍两个人。特警队长潘愚非（王紫逸饰）带领队员,为守护康城的和平与正义,与不法分子斗智斗勇。在一次案件破获中,市民老赵的举证如虎添翼,终使犯罪分子得到了应有的惩罚。正当老赵与潘队一同庆祝小雄的升学宴时,枪王杀手陶欢（冯起龙饰）突然出现,不仅将老赵夫妇残忍射杀,高材生小雄也因脑中枪变成低能儿。多年后,残余恶势力再次犯案,为将他们一网打尽,特警提前布控狙击手,掌握其行动轨迹后,出动全部警力封锁道路,将他们围堵至废弃工厂内进行围剿。正当警方要将被捕嫌疑人押解上车时,现场突现不明身份者,开枪击毙罪证人犯。究竟是谁巧妙避开狙击手视线,秘密潜伏并且破坏警方行动？潜伏在毒贩组织中的警方线人多次提供重要线索,使警方顺利逮捕毒贩头目郭庆东。郭庆东被抓后,其组织成员心思各异,一方苦想救人计划时,另一方企图窃取保险箱的钱财跑路,却不想郭庆东留有一手,给保险箱又加一层保险。时况...Setting position, fan installation position, fan number, fan type, smoke control and exhaust system diagram.