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Finally: Summarize APT attacks again:2. 7. Support environmental protection and low carbon publicity不对，是龙飞凤舞。The policewoman was very calm: "My mother also invested 200,000 yuan. I can't get it back."有一天，未来的视频收到了评论。“我是住在北九州市的山下直斗。我很感动”直斗（NAOTO饰）在急救急救员的工作中面临挫折，但却被未来的歌曲所拯救。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.