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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 BaiduAfter this time the mines have come into play, The company commander also ordered us to take advantage of the gap between operations. To replace the mines that have already triggered the explosion with new ones, I was one of four people on this mission, I remember when I went down there, I saw the bodies of the dogs, I can't help but look at those who were killed by steel balls but were relatively complete. There is one place I am very strange: although they were beaten by steel balls and lay there dead with holes, they had no blood at all, but there were some green things around the bullet holes, which was disgusting to look at. "　　睡上下铺一个关于友情、爱情，也关于80、90后们的故事。四个爱玩游戏的大学男生以轻松搞笑的风格演绎着一个个令人捧腹的故事，你能在他们的表演中找到自己的影子，或许他们的故事就是你的现实。他们是谁，他们和你一样，是热爱游戏、热爱生活的“好青年”……吴梅骤然发现远处似乎有一个庞大的黑影正在移动，紧接着隆隆的马蹄声传来，很是震撼。　　Abigail Spencer饰演Lucy Preston，一个聪明﹑机警﹑热情的历史学教授，被政府带走并参加一项穿越时空的绝密任务。Matt Lanter饰演Wyatt Logan，一同坐上原型时间机器，看着并不靠谱。Malcolm Barrett饰演Rufus，第三名穿越时空的人，是个聪明的...