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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 Baidu3. In the case of cross encounter, when the motor boat takes actions in accordance with subparagraph (2) of paragraph 1 of this Article to avoid collision with another motor boat, if the circumstances permit at that time, the boat on the port side of the boat shall not turn left.Play results directly:1939年底，长沙会战后，抗战进入僵持阶段。同时，汪精卫在上海加紧了伪国民政府的成立步伐，这使得军统在上海的锄奸行动更加频繁地展开。此时，一位特殊的人物从日本来到了上海。他就是汪精卫馁阁的重臣—秦文廉，秦文廉来上海是为了完成汪精卫与日本秘密卖国协议的签署，使得汪精卫伪政府可以顺利成立。军统冯如泰小组执行了刺杀秦文廉的行动。与此同时，中共地下党领导人江虹也接到了延安方面的命令，要从秦文廉处获取一项重要情报—汪精卫与日本人签订的卖国协议内容。这是一份绝密的卖国文件，只有将这份文件公之于众，才能彻底揭露汪精卫的卖国行为，使日汪的和平谎言败露。这样的形势使冯如泰小组的狙击手方滔陷入了两难境地，原来他是中共长期潜伏在军统内部的卧底。这一次，冯如泰要暗杀秦文廉，而中共特工小组领导江虹要方滔确保秦文廉活着。经过一番波折，秦文廉终于安全到达，而方滔的身份则遭到了冯如泰怀疑。日本谍报头目小泉从这次的刺杀行动中感觉到军统和中共都已经盯上了秦文廉，为了确保《日汪协议》不被泄露，小泉布置了严密的保护措施，甚至在Donkey Kong密道的尽头并不是宝藏，而是峨眉派历代掌门人的埋骨之地。你说的太多了。