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Editor's Note: This article comes from WeChat public number "Operation Dog Work Diary". The author is Han Xu, who is the product operation director of Netease News and author of "Super Operation Technology". 36 Krypton is authorize to be issued.Let's first look at how to order a pizza:We know that computers can be used for work, study, entertainment, etc. In addition to the necessary computer hardware, software is also needed. Usually, we call a computer with only hardware but no software "bare metal", which cannot do any meaningful work. At present, software can be divided into two categories according to its use: system software and application software. System software is a program designed for computer systems to efficiently use and manage computer software and hardware resources and support the operation of application software. Such as operating systems, programming languages and language processing programs, network system software, system service programs, etc. Among them, Windows operating system is what we often use. Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, office XP, Photoshop, Red Alert and so on, which we often use.Second handshake: when the server receives syn packet, it must confirm the SYN (ack=j+1) of the customer, and at the same time it also sends a SYN packet (syn=k), that is, SYN + ACK packet. At this time, the server enters the SYN_RECV state;　　与此同时，奉教皇之命的刺客接二连三从圣域来到日本，一场足以载入史册的正邪之战就此拉开序幕……Abnormal state is very important in DNF. It is easy to die without understanding abnormal state. What is the abnormal state of DNF? What are the abnormal states of DNF? Xiao Bian has sorted out all the abnormal states of DNF for everyone here. Let's take a look at them together.此时，张老太太、郑氏和小葱等人，都聚集在清阳街陈家探望大苞谷。