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From the perspective of service, DDoS protection is essentially a war in which users are the main body and rely on anti-D protection systems to compete with hackers. In the whole process of data confrontation, service providers often have absolute initiative. Users can base on specific rules of anti-D system, such as traffic type, request frequency, packet characteristics, delay interval between normal services, etc. Based on these rules, users can better resist DDoS of the seven-layer class and reduce the resource overhead of the server on the premise of satisfying the normal service itself. The detailed schematic diagram is as follows:沉学仪（仪）原本生长於幸福家庭，父亲沉乔（乔）为退休法官，因其弟死於醉酒驾驶，乔常劝人别行差踏错，尤其对仪期望甚高，盼仪能继承父业，令仪感到极大压力，后仪在读大学法律系二年级时认识了富家子文，仪从与文交往中首次感到自由的快乐，二人坠入情网，仪并无事业野心，只想脱离乔过一些自由自在的生活，遂不顾父亲反对。停学与文结婚，令乔对仪的期望成为泡影，父女因而反目。断绝父女关係，乔一怒之下到外国生活。许负看着李玉娘，嘴角浮现出一丝笑意，说道：好，待会我们安顿好了，我便卜卦。(two) the fourth level of physical labor intensity specified in the manual labor intensity classification standard;Weightlifters are in the most full and exciting state of physical strength during the competition. After warming up for half an hour and an hour in the back court, they also lifted more than a dozen or 20 handfuls, which is full of physical strength. However, our amateur training generally lasts for a long time and has a high movement density. Even if we are not used to it or like it, it is necessary to wear a belt after the physical fitness starts to decline in the later period. Don't look after the house and break the world record without you, we don't need this amateur level, don't think so! Also don't think: I squat 150 naked and you squat 160 with your belt tied to your knees, so I think I am actually better than you!2. Product Class: Pizza as defined above is also an abstract class, and specific products are implemented by its subclasses.