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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.佘太君亲率众将出征边关，誓死破除天门阵。领军元帅的人选迟迟未定，杨八妹和穆桂英，一个精通兵法、一个善于布阵，一个征战边关多年深得将士信赖，一个统领穆柯寨拥有帅才之能，老太君权衡利弊最终决定任命穆桂英为三军统帅。"It is incredible to dig so fast, I can also imagine how bad your situation was then. The "killer bees" all over the sky are already very difficult to deal with, Hitting the body can kill people with almost one blow. Two or three big mice can bite off people's limbs. The few besieged one person, which is even more destructive than wolves. However, judging from the history of the war, although the 149 position was hit hard, it finally successfully completed the defensive task. How did you do it? Or how did I get out of trouble? "I wrote down the key points before, stopped writing and then asked.Before, there has always been this question, Big Brother God's answer.富家子麦哲伦变身为保安员黄小强，结果把女朋友毛啦啦、保洁女唐芯和自己公司的业务搞得一团糟的故事。 　　《变身契约》讲述了两对身份迥异地位悬殊的年轻恋人为寻找真爱各自遇到困境，为彻底摆脱困扰，他们异想天开，互换身份，开始融入完全不同的生活和情感中，直到后来身不由己，无力自拔，他们的爱情和生活变得愈加弄巧成拙,窘迫难堪……当麦氏集团未来的接班人、年轻才俊麦哲伦变身为保安队懦弱、缺乏自信的“黄小强”时，当黄小强摇身变成麦氏集团的“麦哲伦”并代表集团出面进行融资谈判时，当富家女毛啦啦狂热追求倾慕已久盛装邀约“麦哲伦”共进晚餐时，当自尊心受到伤害的保洁女唐芯跑到仓库找“黄小强”诉苦而又看到“麦哲伦”给她准备的生日蛋糕时……Second, operate the menu "Drawing", "Block" and "Definition Attribute", or directly run the command "attdef", enter "Elevation" in the "Mark" in the "Definition Attribute" window, enter "Elevation =" in the "Prompt", enter "00.00" in the "Default", use 3.5 for "Text Height", and press "OK" to close the window.