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ACK reflection attack is a common reflection attack technique, Using TCP three-way handshake, When the source IP address of SYN is disguised as Target's IP and the transmitter try to establish TCP connection, the reflector's response will be directly forwarded to Target. In the process of attack, a large number of ACK responses responded by the reflector will be sent to Target by controlling a large number of controlled hosts to perform the clock operation, thus occupying Target's network bandwidth resources and causing denial of service.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.最后，健突然意识到让心爱的人幸福也是一种快乐，他放弃时空穿梭，在宴席上向礼献上最诚挚的祝福……Nikita闯进“组织”盗取黑盒子后踏上了逃亡之路，顺便还带走了Michael；Birkhoff倒向“Nikita”这一方；Alex和Amanda共同执掌新“组织”；“上峰”浮出水面；Percy背后继续操纵守护者。危险升级......海里种，没那么容易的侄儿。反过来看，东南局面重新乱起来，也许恰恰就是党争的后果。循着雪地里的脚印追了一段路，就追不下去了，因为林中好些狗的脚印，这是护林人带着狗巡查时留下的，因而根本分不清狼和狗的脚印。