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Advantages: Adding a new operation is easy, because adding a new operation means adding a new visitor, and the visitor pattern centralizes the relevant behaviors into a visitor object.　　这晚要杀的最后一个人是助理检查官，她曾是麦克斯的顾客。麦克斯决心保护她……包含港式幽默，揭露香港娱乐圈人生百态，这部由梅小青监制的电视剧《娱乐插班生》，开创了影明星艺人的先河。张学友、梅艳芳、罗文、徐小凤等天皇巨星，全都被TVB一众演技精湛的艺员惟妙惟肖的模仿出来，成为一时佳话。此剧於1995年播出时大受欢迎，创下收视佳绩。此剧云集众多好戏之人如林家栋、廖伟雄、梁小冰、梅小惠、黎耀祥、江欣燕、阮兆祥和麦长青等，令观众目不暇给。 最深入民心的当然要数扮演张学友的林家栋，他挤眉弄眼地模仿张学友的种种神态及小动作均让人忍俊不禁，教观众惊喜万分，连张学友本人亦觉得他实在扮得太像自己。此剧可算是林家栋的代表作，他在TVB熬了多年，担演过无数剧集的大配角；终凭此剧一炮而红，挤身男主角行列，其後更拍下多套经典作品如《大闹广昌隆》、《茶是故乡浓》和《酒是故乡醇》等。《无须喝彩》是以中国南方某城市一群女子特警的工作、生活、爱情为主线展开的公安题材青春偶像剧。它以丰富的艺术表现手法，成功展现了该市的一支女子特警队从无到有、从执行街区巡逻警务到承担国际重大任务的全部过程；它以真实不虚的社会视角，形象展示了女特警的思想和工作不断走向成熟的曲折历程；它以全息透视的手法，充分描述了她们挥洒泪水、血汗的感人场面以及克服重重困难甚至不惧死亡威胁的动人情节。If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.