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(3) Vision: Both eyes have not undergone any surgery, and the naked vision of any eye (according to the C-character visual acuity chart) is not less than 0.3, without color blindness, color weakness, strabismus, severe trachoma or trichiasis;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:In the future, we will continue to meet new world and unknown challenges. May Huaxia walk with you all the way through every spring, summer, autumn and winter. I wish you a happy New Year and a happy family. ~If it is possible to restart the database service沈悯芮也颇为好奇地凑过来：这个琴弓是用来拉的么？对，琴弓拉在几根弦上。2030年，JS公司代号为JX003的大型网游问世。这款最新研制的虚拟空间系统，通过特殊传感器可以使玩家进入虚拟游戏空间，亲临跨越时空，体验游戏人物的真实感受。