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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.　　李政宰饰演张泰俊，他是4选议员的首席辅佐官，他以第一名成绩毕业于警队，曾活跃在搜查前线，但为了拥有更大的权力而进入国会，是一个把不可能变成可能的超级能力者。他有着出众的直觉和冷静的判断力，自在地游走在边界线上，以偏执的胜负欲把自己辅佐的议员推到党内代表的位置上。但他并不满足于现状，指向权力顶点的更大的执念隐藏在他柔和的笑容下。故事围绕大学生久住春彦(猪塚健太饰)和官能小说家木岛理生(竹财辉之助饰)展开。因为一场意外，久住春彦骑车不小心导致了木岛理生骨折，而暂无他法的久住春彦只能提议让木岛理生口述写小说。两人之间你侬我侬的纠缠情感就此上演。作为邻居，陈文羽经常帮着许阿姨做一些粗活，他们两家关系挺好的。高凡看着这场景，又想起始作俑者那个破烂孔明灯，心揪紧了疼痛：张家人放火都是一把好手，跟火也有缘。3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.