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我们走的时候给大哥留个记号，他回来了自然会将公主偷偷带走。? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?电影《血战迷魂岭》讲述号称“八面枪”的徐文升在剿灭关东第一艳匪压北疆的过程中，看到了县衙鱼肉乡里欺压百姓，真正的土匪却是在 除暴安良、杀富济贫。姿色出众，武艺高强的压北疆经过与徐文升几次冲突较量后，暗生情愫，最终两人联手为民除害，肃清了地方流毒。SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.tvN灵异刑侦剧《你是谁(Who Are You)》。讲述了苏怡贤与泽演饰演的刑警通过与物证中留下的灵魂交流破案的故事。苏怡贤饰演因一起意外沉睡6年，醒来后变得拥有特殊能力，能看到死者灵魂的刑警。泽演饰演只相信亲眼看到的事物，因常惹麻烦而被指派给苏怡贤当手下的热血刑警。接档《恋爱操作团》。Here's my card. My card——我从不因被曲解改变初衷，不因冷落而怀疑信念，亦不因年迈而放慢脚步