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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.某日，约翰载着布兰登，开车行驶在回家的道路上，两人将车暂时停在了一间加油站处，殊不知这一举动彻底改变了他们的命运。在加油站，布兰登遇见了乔（马特·欧莱瑞 Matt O'Leary 饰），后者是黑帮领袖比利（加内特·赫德兰 Garrett Hedlund 饰）的弟弟，拥有着和哥哥一样凶残冷酷的个性，约翰脑海中有关儿子最后的影像，是他倒在血泊之中的模样。重重波折之后，法院释放了乔，因为凯文决心亲手替儿子报仇，曾经平凡而又和善的男人，义无反顾的踏上了一条充满了暴力和鲜血的道路。屋子里还坐着好些队长，闻言愕然地看向常飞。"These DDoS attacks have become very sensitive topics and we cannot discuss them publicly now," said CISO of a medium-sized bank in the Pacific Northwest."As long as they are hit, they are basically shot one at a time. The lethality of steel balls is much smaller than that of bullets. A dozen or twenty bullets can also kill one. They are animals after all, and they are still afraid of bullets. However, the speed is fast and it is really difficult to deal with." Liu Guangyuan said.既然如此，汉军为何还是要正面从井陉口进攻呢？韩信到底在想什么？或者说他到底想要看什么？莫非他是奔着赵王本人来的？擒贼先擒王倒是不假，只是这十一万赵国大军可不能视若无物。The spiritual world of type B blood is also very rich, Some of them have interesting souls. They will go to various libraries and museums to read books and visit when they rest. They can follow up and express their unique opinions on whatever topics you are interested in and want to talk about. This will make you have a deeper impression on them.