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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　　黑桃Q选择从香港游回大陆，一上岸直接被海防民兵抓捕。边防某部作战参谋陈亮的前妻去世多年，如今陈亮和身为公安的妻子石云一起照顾着他和前妻所生的儿子毛毛。特务组织要派年仅27岁的黑桃Q回大陆组织一次特别的特务行动，回来之前他专程去了趟日本，用毒酒毒死了把他带入特务行当的干爹。黑桃Q游回大陆，一上岸直接被抓捕。石云提审黑桃Q，黑桃Q叫出了石云的原名“肖流云”，石云大惊。之后，黑桃Q便在监狱中食物中毒死亡。Number of plaintiffs: 17他说着，感慨地望向杨长帆：苦事，多说无益，我这辈子剩下的期盼，就是不要孩子再吃我这个苦，受我这个罪，最后落得什么都没有的结果。Based on BIM technology, it can dynamically display the installation of important parts in advance and provide virtual reality information for construction scheme discussion and technical exchange. Subway construction may have an impact on the surrounding buildings. BIM technology can simulate the impact of subway construction on the surrounding buildings. Combined with reinforcement technology, it can judge whether the arrangement between various components is reasonable, control the construction progress, carry out comprehensive quality inspection and observation on the construction, dynamically simulate the change trend, and put forward improvement measures.林朵渔、纪琴、颜樱是大学同学，她们曾经分别拥有过幸福，却都在三十岁这一年，因为生活观念、孩子、价值观不同步等原因，婚姻出现了问题。林朵渔和前夫都忽略了感情沟通，事业上的不同步更让他们变得生疏；纪琴的前夫不懂协调寡母与妻子的关系，家中有了婆媳矛盾；颜樱婚后一意孤行不愿要孩子，丈夫出轨，离婚后，她与前夫的感情藕断丝连。三位“前妻”经历着风雨，也实现着成长。对她们而言，最难过的莫过于前妻这个身份，但也正是这个身份成就了她们。她们顽强地走出因为婚姻失败带来的自我否定的困境，还积极地开始新的生活：林朵渔与前夫在长辈的撮合下重新得到了理解；颜樱与前夫正视了彼此斩不断的感情，携手解决难题；纪琴也找到了作为事业女性的存在价值。面对生活的重击，她们找回了幸福。In 1477 Charles the Bolds dies, his only child is a girl which cannot rule w/o a husband. Meanwhile in Austria, Emperor Frederick III and his antagonist Louis XI France battle over said marriage prospects, battles ensue, tragedy falls.