91国内自拍视频

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.-Just out of the comfort zone, don't leave too far, go too far into the panic zone, in the panic zone is very difficult for people to stick to, just stand on tiptoe and encounter the range is the most suitable.The essence of the division of the three worlds is a classification based on the different levels of development, political systems, historical and realistic relations of various countries in the world. However, this classification is extremely impressive and has guided China's diplomacy for many years.赵锋若是没历练些本事出来，也不能升为营指挥使了。不过现在已经有两年没有接到戏了。