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You can see that PizzaStore depends on a SImpleFactory, which depends on an abstract pizza. Under normal circumstances, to decouple, control inversion is required. The core idea of control inversion is that neither the upper structure nor the lower structure depends on implementation, but on abstraction.Amplification attack is a special reflection attack. The special feature is that the reflector has the function of amplifying network traffic and is a common technical means in DDoS. Its basic principle is relatively simple. For a C/S service, if the Server-to-Client Response message is larger than the Client-to-Server Request message, the traffic is enlarged. In order to use amplification technology in DDoS, one condition needs to be met, that is, the services provided by Server are based on connectionless protocols such as UDP.于是，秦溪又露了一把脸。汪魁手执钢刀走上前，摆了个架势，高高扬起雪亮的钢刀——刀下留人。Http://www.freebuf.com/articles/neoppoints/152457.html马切特·西努立体思维非常厉害的人,可没用于正路上,被关在大牢里,乘警方向他求助追捕逃犯时越狱了.尚卡尔,水文专家,一心为村民找到水源,从而缓解村民用水之难.可却被不法商人以及老师同学背叛,被追杀.马切特·西努和尚卡尔是长得一模一样.机缘巧合之下,卡迪雷桑利用尚卡尔被追杀而入院的事互换了他们的身份,从而卷入了尚卡尔村子的事件中.他本想捞一笔就走人,可是,被村子里的人和事感动了,于是.......