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Main process points: establish civil engineering model, establish pipeline and equipment model, collision detection, collision elimination and deliveryCompared with the online work class, the online work class mode company was established relatively early and has a relatively rich variety of courses. Thanks to the long development time, its curriculum has been continuously polished and matured in market feedback. In addition, its company's positioning has been continuously adjusted according to market demand, forming a relatively accurate positioning, with relatively wide product coverage and more specific details. However, there is a new trend that is worth noting. At present, most offline thinking ability training institutions have also begun to think about online development to effectively supplement offline education.1. HTTP flood attackAs shown in the above figure, the server side provides NTP service. Attacker sends an NTP monlist Request to the server, but its source IP address is not its own IP address, but the IP address of the target. After the server receives the request, it will send a Response message to Target (not Attacker). Since Reponse contains 600 time synchronization records with Server, which is much larger than Request and consists of many messages, amplification is realized.朝镜子上一看，镜面上是一张青涩的脸。从小行侠仗义的小张飞和小关羽，因为保护女同学，被幼稚园主任开除。两人因为类似原因不断被开除学籍，某天来到一高中前的假八门金锁阵挡住无法入学，认识了穷贵族 -- 刘备。刘备为利用二人，提议桃园三结义，结为兄弟后都跻身贵族，便能一起去读贵族学校。结拜时讲到「同年同月同日死」时，刘备被飞来的大石头压倒昏死，以为大哥刘备死掉的关羽为实现承诺要自杀，张飞只好将他打昏 ，然而肇事者却是从铁时空来到银时空旅游的大东、丁小雨、亚瑟王以及呼延觉罗·修。