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玉米疑惑，强调道：我问你怎么样才能日进斗金。Singleton: Guarantees that a class has only one instance and provides a global access point to access it.However, if you use factory mode, you only need to modify the factory code. If other places refer to factories, you can modify only one place and other codes will not move, which is decoupling.　　强出狱，知道鹏夺其女友，酒后胡言，指鹏今日成就，全仗其与伟之功，鹏感不悦，顿生戒心。 　　Korean title:? ?The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.