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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.《Train》讲述在杀人事件发生之夜，因瞬间的选择而分裂的两个世界中，为了保护珍贵的人而介入连环杀人的刑警的平行世界的悬疑电视剧。　　绫罗记Methods:Publish-subscribe mode is also called observer mode. It defines a one-to-many relationship between objects, allowing multiple observer objects to monitor a topic object at the same time. When an object changes, all objects that depend on it will be notified.电视剧《生或死或父亲》的主人公是以简·苏自己为原型的蒲原朱子。20年前失去母亲的她和她的父亲哲也过去曾到过绝交的边缘，但现在却变成了时常见面聊天的关系。有一天，常子开始连载关于父亲的随笔。为了搜集素材而和哲也见面的她，与父亲和母亲的相遇，失去了全部财产，以及其他女性的影子，挖掘出不仅仅是愉快的记忆。Article 29 A fire-fighting technical service institution shall set up a technical person in charge to supervise and manage the quality of the fire-fighting technical service of the institution and to conduct technical review of the written conclusion documents issued. The technical person-in-charge shall have the qualification of a registered fire engineer, and the technical person-in-charge of a fire technical service institution with first-level qualification and second-level qualification shall have the qualification of a first-level registered fire engineer.