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Operating system - Wikipedia
What is an operating system (OS)? - TechTarget
操作系统 - 维基百科,自由的百科全书
Operating System Tutorial - GeeksforGeeks
Operating system (OS) | Definition, Examples, & Concepts
操作系统 - 维基百科,自由的百科全书
Operating System (OS) Definition & Examples - Lifewire
What is an Operating System? - How-To Geek
操作系统(计算机管理控制程序)_百度百科
What Is an Operating System? - Coursera
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