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2. Second handshake: The server receives SYN message segment. When the server receives the SYN message segment from the client, it needs to confirm the SYN message segment and set the Acknowledge Number to x+1 (Sequence Number+1); At the same time, I also need to send SYN request information, setting SYN position to 1 and Sequence Number to y; The server side puts all the above information into a message segment (i.e. SYN + ACK message segment) and sends it to the client side. At this time, the server enters the SYN_RECV state.　　第二季将会更加深入挖掘这些角色的故事，探索恶意的谎言、友谊的持久性、婚姻的脆弱性以及恶毒残暴的家庭教育。关系会被磨损，忠诚会被侵蚀，情感与身体上的伤害也将现形。Handle (Handle or Descriptor, referred to as Handle under Windows and Descriptor under Linux): Essentially represents a resource (such as file descriptor or socket descriptor for network programming) provided by the operating system; This resource is used to represent events one by one, which can come from both the outside and the inside. External events such as the client's connection request, the data sent by the client, etc.; Internal events such as timing events generated by the operating system. It is essentially a file descriptor, and Handle is the birthplace of events.Two, civil aviation pilot level:讲述的是普通社区派出所里的故事，虽然故事从炊事班搬到了派出所，但六位主人公的性格并没有发生本质变化，只是每个人都多了一项绝活。洪剑涛饰演的洪所长不露声色却很能“团结”群众；范明演的范警官一心想当所长，他是个谈判专家，也是个话痨级的人物，有点像《大话西游》里的唐僧，能把罪犯烦死；毛孩是个反扒能手，外号“无肺”擅长长途追击，没有几个小偷跑得过他，他的缺点是，常常一时兴起跑得太快把小偷甩了；姜超演的姜警官可以过目不忘，在不知不觉中抓住罪犯；沙溢毕业于警官大学，外号“沙尔摩斯”，喜欢研究犯罪心理学和犯罪痕迹学；周小斌饰演老片警，管区内的混混都很怕他，但他却搞不定患上网瘾的儿子。Article 30 Anchoring ships and grounded ships