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Sand pile paradoxWe 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.花无缺依旧是淡淡的微笑，神情没有丝毫的变化。在Nikita决心与组织对抗的时候，她遇到了一个吸毒的小女孩，并改变了小女孩的命运。俞大猷仰天狂哮一声，抽出刀刃，凝视众人。(4) Other conditions for each individual qualification to be obtained at the same time.