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学生也不能随意污蔑他人。Hee hee hee万众瞩目的CSI即将开播，让我们一同期待老G将会给我们带来什么样的惊奇。（当然他的离去不算在内。。。）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.若你们现在就跟着我。2. Credibility includes two elements: one is the credibility of the disseminator, including honesty, objectivity, fairness and other character conditions; The other is professional authority, that is, whether the disseminator has the right to speak and the qualification to speak on specific issues. Credibility is divided into two types: high credibility and low credibility, namely stars and ordinary people. For the audience, if it comes from different disseminators, people's acceptance of it is also different. The higher the reputation of the star, the higher its credibility. Choosing a star to speak for a certain brand, relying on the star's leadership charm, the enterprise can transfer the star charm to the product and transform it into the connotation of the product to endow the product with new vitality and cordial association./cackle (grin)