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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.There are many reasons why feedback weaponization is actively used by bad people, including: trying to suppress competition, retaliating and covering up their whereabouts. The screenshot above shows a black market post discussing how to use Google to beat competitors.一批毒品在警方押运途中被一伙蒙面歹徒劫夺，三名随行警员被害，种种迹象显示警方内部有人走漏消息。蒙面团伙的首领John Corbett成了AC-12的新一任对手，但他还有不为人知的另一重身份……　　本剧根据陕西著名作家、杨凌作协主席贺绪林历时十载精心打磨的长篇历史小说《兔儿岭》改编拍摄，有苍凉开阔、厚重雄强、气势恢弘、丰赡大气之感。是一部关中土匪的惊世传奇，更是一曲西府秦人的慷慨悲歌。秦人秦声、秦风秦韵扑面而来，充满着一股强烈的阳刚之气，让人慷慨激昂、热血沸腾，如同听了一曲激昂悲壮的秦腔。Setting position, system form (wet type, dry type, pre-action, open type, closed type, etc.), alarm valve position and quantity, water pump adapter position and quantity, and whether there is any roof fire water tank connected with this system and automatic sprinkler system diagram.张念祖、李山也上去扭呀扭的，跳得像蚂蚱。"Why?" I went on to ask.