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片剂质量的要求是
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Linux is a family of open souce systems, which means that they can be modified and distributed by anyone around the world.
Operating systems for mobile devices generally are as fully-featured as those made for desktop or laptop computers.
Without an operating system, a user can not run an application program on their computer.
The three most common operating systems for personal computers are Microsoft WIndows, Apple Mac OS X, and Linux.
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