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板栗见几位老人中气十足，放下心来，陪着他们说笑一会，又去了女眷那边。7. Do not know how to refuseIn 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.Qu Shuihua, 5G Network Engineer of China Mobile: The population density of the city is relatively high, the buildings in the city are relatively dense, and the whole wireless environment is relatively complex. The planning pilot projects of 2G, 3G and 4G have almost run out and the space is not large.芭比是时尚偶像，她的家富丽堂皇，好朋友们和完美先生都为她着迷。 她样样精通，却依然谦逊而亲切，她不断鼓励她的朋友们直面任何挑战。Raquelle 大胆畅想，野心勃勃，总是想超越芭比。二十一世纪的狂傲杀手莫筱筱意外来到了异世界，刚醒来就成了祭祀品，好在被景王救下。在这里莫筱筱一改往日的冷酷，化身成了一个调皮捣蛋的萌妃，与景王相爱相杀。我会转告。