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In the near future, glacial melting has covered 98% of earth's landmass. Sharks have flourished and now dominate the planet, operating as one massive school led by a mutated alpha shark.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.Execute "python jop.py"? Command, attack, you can see that the system ("/bin" sh ") function was successfully executed, and the attack was successful.因为和周家之间的计源和恩情，以及两家之间密切的合作关系，徐家和周家走在了一起　　因为守护的不单是珍宝，还有自己的信仰和良心，所以绝不能失守，哪怕只一次。他说什么你都听？另一护卫质问道：他不是才拉的屎吗，怎么又拉？先前的护卫辩解道：他说狗肉吃多了，闹肚子，我还能不让拉？你们瞧那边，他真拉了，屎还在那呢。