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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.After all the preparations were ready, we went to Nandashan Town, Yuanjiang City, Hunan Province, the destination of our college students' summer social practice activities in the countryside. Nandashan Town, Yuanjiang City, Hunan Province, is located on Dongting Lake 800 miles away. It is rich in aquatic resources and has its own characteristics. It is famous for its rich wild snakehead. There is a vast lake continent outside the embankment, with an annual output of 4000 tons of wild snakehead. There is a wild snakehead stocking area of 5000 mu in the embankment, with an annual output of 1000 tons and an annual output value of 1. The total number of farmers engaged in the snakehead industry in the whole town reached 3,000. Last year, the snakehead industry alone increased the income of 600 yuan. In recent years, the town party Committee and government have taken wild snakehead cultivation as a pillar industry for rural economic growth and have taken various measures to encourage farmers to raise snakehead. In 1998, Nandashan Town Ophiocephalus argus Breeding Cooperative was established to provide prenatal, intrapartum and postpartum services for the whole town's Ophiocephalus argus Breeding specialized households. Four service centers have been set up, namely, Ophiocephalus argus Breeding Feed Service Center, Ophiocephalus argus Breeding Technology Service Center, Information Service Center and Intensive Sales Service Center.只是如此一来，我南雀国必然会举国致哀。然后迅速扩散，改变世界——。◎ ◎ ◎ ◎ ◎ ◎昔年，中原武林“铁血大旗门”遭遇灭顶之灾，侥幸逃脱的大旗门少年弟子铁中棠、云铮等在掌门人云翼的带领下远遁荒漠卧薪尝胆，伺机复仇。十多年后，云翼认为时机成熟，便率领大旗门人，重返中原武林。不料，云翼长子云铿与大旗门死敌寒枫堡主冷一枫的长女冷青霜坠入情网，险些使大旗门再遭灭门之灾。云翼愤怒之余命掌刑人铁中棠将云铿五马分尸。云铿之弟云铮私下寻仇，陷入重围暴露大旗行踪。云翼震怒之下，将铁中棠、云铮赶出大旗门。铁中棠设下疑兵之计，牵制五福联盟，云铮现身拼命，身受重伤。铁中棠冒死救出云铮，却被云铮误会投靠“五福联盟”而被敌人抛下断肠谷。铁中棠死里逃生，在深谷遇一生至爱空谷幽兰“水灵光”，得“大旗门”掌门令旗、宝藏及“大旗十二式”剑法。并将灵儿带出深谷，两人携手重入江湖，并在洛阳李家庄上演了一场“珠宝风云”，而当时云铮被赵奇刚救走后，在出逃的路上巧遇风尘美女温黛黛，两人感情升温后也结伴来到洛阳大会，不料九子鬼母率众前来寻仇，让珠宝大会无法再开下去，庄主李洛阳出于江湖道义誓死保护全庄上下...这可是大水冲了龙王庙，一家人不认得一家人了。