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又与小辈们寒暄，再在周夫子引见下，朝各方宿儒抱拳问好。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日军特高课在长治秘密训练特别挺进队，其队员个个身怀绝技，穿着八路军服装，模仿八路军的生活方式和训练方式，并且用战俘进行实战训练。同时还秘密派遣大量谍报人员潜伏我抗日根据地搜集情报，并实施破坏活动。八路军针对日军的C作战计划，快速组建了一支特战大队，与日寇展开了一场惊心动魄的特殊战斗。刘家兄弟也都十分愿意出力。Weapons, jackets, underwear严世藩的死，了结了一个时代，也终结了故人的冤屈。若是你整天心惶惶的，让这些比你小的弟妹们咋办？我也担心葫芦哥，小葱也担心，可是我们都相信，等仗打完了，葫芦哥就会回来。