题目内容
The operating system is often referred to as the software platform.
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Smartphones generally include a network operating system.
Because Mac OS X market share is so large, more application programs are developed to run under Mac OS X than any other operating system.
Linux is a popular and powerful alternative to the Windows operating system.
When a single physical computer runs a special program known as virtualization software, it operates as though it were two or more separate and independent computers, known as virtual machines.
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