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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.70年代末期，寡妇侯玉倩意外地捡到了一个弃婴，可侯玉倩只是街道工厂的一名普通女工，家境贫寒，况且膝下已有二子，由于生活艰辛，她只能供养一个孩子念书，如果收养了这个弃婴，日子定会雪上加霜，侯玉倩只好把弃婴送走。可事情突变，当她再次看到弃婴那种不忍目睹的凄凉景象时，善良之心又让她把弃婴重新抱回家中，决心不管生活多么艰难，也要把他抚养成人，并按照孩子名字的排序，给他取名叫窦兆辉。时光迁徙，岁月流逝，窦兆辉在侯玉倩的呵护与关怀下长大成人，成为一名出色的外科医生。　　晶晶自小因车祸父母双亡，眼睛失明。从小她就怀着积极的心态去面对生活里的一切。可善良的女孩也要遭遇不公。当她赶到电台时，迎接她的是……知名DJ谭丽娜出现，为了迁就谭丽娜，晶晶的节目被安排在晚上10点。对于一个盲人来联邦星舰"航海家号"被一股神秘的外星力量送入了δ象限, 船员们面对的是一条长达75年的漫长的返乡旅程。Finally, Wobany attached a diagram of how to make the crystal head of the network cable.陈启眼中闪过一丝惊讶。