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1949年冬天，蒋介石和毛人凤妄图在大西南苟延残喘，与新生的人民共和国相对抗，在重庆完成了震惊中外的渣滓洞、白公馆大屠杀后，秘密来到成都，向麇集在这里上万的军统特务和各路特务，布置了“密裁、破坏、潜伏、游击”四大任务。于是，当我刚刚组建的年轻的人民公安，随解放大军进入成都这座全国最后解放的一座大城市的时候，便面临着极其严峻、尖锐、激烈、复杂的铲除残匪，肃清敌特，保卫人民生命财产，保卫新生红色政权的……3.3. 3 create event 2 (start event per minute)Potential can be constructed//071江汉海关代理关长关汉生（李幼斌饰）与魏庭坚、舒岚（史兰芽饰）夫妇以及张怀兵曾经是同生共死的战友。关汉生因承办“506案”不力被解除职务，异地安排。为了揭开黑幕，他顶着巨大压力重回江汉海关办案，不料却一步步掉入“506案”幕后黑手张怀兵的陷阱，并镗锒入狱。与此同时，关汉生养育了二十八年的儿子关双，在得悉张怀兵才是自己的亲生父亲之后也离开他、重回生父张怀兵身边，对于关汉生的各种致命打击接踵而至，但关汉生的反击却始终没有停止。后来见鲁三叔不交货，就一直带人追杀我们。First broadcast: October 17, 2009In 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.