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作業系統是您打開電腦或伺服器時首先開始的程式。所有其他應用程式依賴它來正常運行。一些流行的作業系統如Microsoft Windows，Mac OS和Linux。

Microsoft OEM WIN PRO 2000, 0.006 GB, 133 Mhz or higher Pentium-compatible Central Processing Unit (CPU). Windows 2000 Professional..., Microsoft (MS) Windows 2000 Professional (1 Pack) - OEM

Microsoft OEM WIN PRO 2000. 最低 RAM: 0.006 GB. 處理器最低配置: 133 Mhz or higher Pentium-compatible Central Processing Unit (CPU). Windows 2000 Professional..., 相容操作系統: Microsoft (MS) Windows 2000 Professional (1 Pack) - OEM

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Microsoft OEM WIN PRO 2000