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  1. Operating system - Wikipedia

  2. 操作系统(计算机管理控制程序)_百度百科

  3. What is an Operating System? - GeeksforGeeks

  4. 操作系统 - 维基百科,自由的百科全书

  5. Operating system (OS) | Definition, Examples, & Concepts

  6. 5 Types of Operating Systems to Know - Coursera

  7. What is an operating system (OS)? - TechTarget

  8. What is an Operating System (OS)? Definition, Types & Functions

  9. Operating System (OS) Definition & Examples - Lifewire

  10. How Operating Systems Work - HowStuffWorks

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