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How to improve the classification ability? Apart from practicing and thinking more, I think the core is two points:Unconnected queue: In the three-way handshake protocol, the server maintains an unconnected queue that opens an entry for each client's SYN packet (syn=j), which indicates that the server has received the SYN packet, sends a confirmation to the client, and is waiting for the client's confirmation packet. The connection identified by these entries is in Syn_RECV state on the server. When the server receives the confirmation package from the customer, the entry is deleted and the server enters ESTABLISHED state.Safe Distance Answering Skills③ Distribution3. Use Red Lotus while the flame gun is in the state and enter the 15-second CD;十七世纪初，不明飞行物出现在朝鲜上空，由此开启了一段绵亘四百年的传奇因缘。时间来到当代，当年来到地球的外星人以大学教授都敏俊（金秀贤 饰）的身份生活在韩国的普通人中间。还有三个月一枚彗星即将接近地球，届时这个在地球上滞留了四百年的外星人将得以返回故土。只不过，在此之前他总会想起初来之时遇见的少女徐宜花（金贤秀 饰），也渴望再见到12年前救过的一个小女孩。敏俊与颇受人诟病的国民偶像千颂伊（全智贤 饰）比邻而居，而且后者又是他所在大学的学生。最初的交流并不顺畅，但敏俊很快发现这个女孩和他竟有着如此深的渊源。As a result, we can certainly imagine that what we did at that time was not professional, and Push was much slower than the professional information platform. After all, we did not have a fast mechanism and backstage.