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A command in command mode refers to an instruction that performs certain things.一个至死不渝的誓言，一段生死离别的爱情，编织着一个爱情故事！ 　　一个关于信仰的真实传说，一个关于爱情的凄美童话，一曲关于生命的悲惨挽歌。 　　该剧围绕两男一女的情感纠葛展开故事：孤儿欧阳、父母被打倒的闻汐与寄养在外婆家的叶雨三个人青梅竹马，分别之际叶雨留给了欧阳一份纯真的誓言“长大了我来找你，别忘了”。成年后的三人境遇迥异，失去唯一的亲人叔叔的欧阳终于考上了大学，进入省城后先后重逢了已是高干子弟的闻汐和富家女叶雨。艰难养活自己的欧阳在得知闻汐也钟情与叶雨时，自尊心驱使欧阳拒绝了叶雨的誓言。毕业后欧阳被分配到边远的小镇，几年后他重回省城，落魄谋生。在遭遇一场火并案后，一切真相大白，最终欧阳和叶雨重逢在了海边……The advantage of OVO is that when there are many categories, the training time is less than OVR. The disadvantage is that there are many classifiers.If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.