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《火速救兵》（英语：F.S.D.）是香港电台电视部与香港消防处联合制作的单元剧。的，是一班临危不乱的救护员。他们为痛得呼天抢地的伤者进行急救、为吓至惊魂未定的市民伸出救援之手。勇气不是上天赋予，处变不惊的能力也不是一朝一夕而来的。消防员和救护员的「周身刀、张张利」，是艰苦训练的成果。由消防处长至所有消防员，都是由训练学校这个大摇篮培育出来的。在短短的二十六周内，学员学到的岂止是救火救人的技术，还有团结合作和不分你我的无私精神。……广场中央，小鱼儿和花无缺进行最后的生死对决。叶向晴（佘诗曼 饰）本是含着金汤匙出生的千金小姐，却因为父亲的去世而失去了所有，于是，她和哥哥向阳（麦长青 饰）不得不自食其力，靠经营粥艇维持生计。某日，叶向晴遇见了名为潘卓华（黄浩然 饰）的男子，后者的英俊和善良吸引叶向晴坠入了情网，然而，叶向晴和潘卓华之间的身份和地位差异巨大，两人的恋情遭到了潘卓华家人的强烈反对。The total wage consists of the following six parts: hourly wage; Piecework wages; Bonuses; Allowances and subsidies; Overtime pay; Wages paid under special circumstances. It does not include welfare expenses.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 BaiduAttention: Please click "Oriental Education Times" under the main title of the article.