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Before his father died, Li Lei used limited time to accompany him, but the two taciturn men only talked about treatment and hospital life. They are very secretive about the foreseeable farewell.那个军士带着周菡的信，赶了几十里路，送到周家所在的小镇——牛头镇。Such as XX version!青春就是在奔跑中受伤，又在颠沛流离中期待阳光。青梅竹马的李涛（任宥纶 饰）和张声（廖语辰 饰）因命运相知相识、因网球互助扶持：面对家人对选择网球之路的反对，张声毅然支持李涛；不慎受伤影响网球生涯，是李涛赋予张声前行的力量...两人在一次次挫折中渐明爱意，而张声永远的保护伞卫畅（卢东旭 饰）、心属卫畅的付萌萌（章乐韵 饰）也大胆追梦、勇敢逐爱，即使受伤依然无所畏惧，鲜衣怒马的少年们最终都以青春的意志和昂扬的姿态收获了自己的成长。Industry 4.0 proposed by Germany has three major themes: first, intelligent factories, focusing on intelligent production systems and processes, and the realization of networked distributed production facilities; The second is intelligent production, which mainly involves the production logistics management of the whole enterprise, human-computer interaction and the application of 3D technology in the industrial production process. The third is intelligent logistics, which integrates logistics resources mainly through the Internet, the Internet of Things and the Internet of Services to give full play to the efficiency of existing logistics resources.When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.六千人也不带？苏岸讶然追问。