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When frying, remember to wipe off the juice on the surface of the steak, so that it will be fragrant!The simple understanding is that photometry is in charge of the light and shade distribution of the whole photo, with the central focus on photometry and uniform light and shade of the photo. The spot metering is more suitable for shooting the actors on the stage, that is, taking the actors as metering spots, and the photos taken are based on the brightness of the actors, rather than the shady scenes around the actors.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.老将军也就罢了，那是出了名的狠辣，这个黎章，竟然敢挟持青鸾公主，以死相逼，只怕比老将军更狠辣。哼……沈悯芮想了想。7? Network-based Countermeasures　　●二十一世纪什么最贵？人才！