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On personal computers, there are five most commonly used operating systems: DOS, Windows, Unix/Xenix, and OS/2. DOS System-In the 17 years since its inception in 1981, DOS has undergone 7 major version upgrades, from version 1.0 to version 7.0 now, continuously improving and perfecting. Windows System-Windows is the first generation of window visual interface published by Microsoft in November 1985, which makes PC enter the so-called GUI (Graphical User Interface) stage. Unix system. Unix systems were initially used on small and medium-sized computers. Unix is a multi-user system, which generally requires more than 8M of memory and a large capacity of hard disk. Linux system-Linux is the largest free software in the world at present. It is an operating system with functions comparable to UNIX and Windows and has complete network functions.The fairest thing in modern society is that the learning threshold is low and the learning opportunities are common. It is the best way to rise, and it is also the elevator for beautiful women to take shortcuts to squeeze into the upper class.[Collection Value]俩人边喝边吃边唠家常，从鸡毛蒜皮的人际关系一直聊到了国家大事，然后话题也不知道怎么的就转到了学生时代，继而谈到了初恋。反正，我和杨长帆，是做不成朋友了。The attacker sends a large number of HTTP messages to the target server through proxy or zombie host, requesting URI (Universal Resource Identifier) related to database operation or other URI that consumes system resources, causing the server to run out of resources and cannot respond to normal requests. For example, HTTP Flood attacks often occur on portal websites. The biggest feature of attacks is to select URIs that consume server CPU or memory resources, such as URIs with database operations.