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新世纪的高中生没有考上大学靠自学成材走向社会，成为国家栋梁的故事。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.　　Unicom孙鬼精神百倍地答一声是，自去守在门外。好笑道：你们为什么不问问林火长自己呢？黎章听了两眼一亮：对呀。本剧参照《史记》、《汉书》相关记载，主要讲述卫子夫的人生经历。她出身卑微，入宫后生下长子刘据，成为汉武帝刘彻的第二任皇后。她只是一介平民歌女，没有娇艳媚态，没有显赫家势，但却凭着睿智兰心和建立“和谐后宫”的决心，令一代雄主汉武帝与她相守四十八年，她是中国历史上第一位有独立谥号的皇后，也是在位时间第二长的皇后。卫子夫的经历不仅改变了自己的命运，同时也改变了一家人的命运，其弟大将军卫青、外甥骠骑将军霍去病都是汉代历史上著名的军事英雄。卫子夫以其优良的品德，赢得了汉武帝的恩宠，也赢得了大臣和后宫人等的尊敬，为汉朝的发展作出了一定的历史功绩。