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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.二十多年前,一对相恋的知青偷偷生下了一对双胞胎,迫于形势,他们将双胞胎远送他乡。二十多年后,生长在潖江村的弟弟张向泉,在村里招商征地的索赔过程中,发现了自己不一样的身世。哥哥赵引泉也在偶然的机会,发现了自己的身世之疑。兄弟俩开始了寻亲之路。此去江东可谓是任务艰巨，有些事情还是多问问汉王没画出。********秦淼见他放赖，跟葫芦相视一笑道：有，我给你们都准备了东西。There are two ways to configure Path variables, but Method 1 does not apply to WIN10 systems:顿时急了，忙张开双臂，护住其中一辆马车，紧张地问道：你们想干什么？刘黑皮愣住了：这好没干好事哩，先让人当歹徒了。以天灵门作为修行起点的梁夕结识了朋友与师尊，又阴差阳错从妖兽身上获得了神秘兵器坎水刃。坎水刃乃是云麓仙居开山祖师的法宝武器，他们要求梁夕归还，但如果梁夕能让龙息淬炼坎水刃的话他们就不予追究，否则就要天灵门付出代价。看出云麓仙居是借故找茬的梁夕决心前往东海寻找龙族，却因为意外吸入龙族血液，成为了天地间第一位龙族外戚。在向龙神说明情况之后，梁夕达成了龙神提出的要求，成功让坎水刃被龙息淬炼，也救回了师门。