题目内容
Operating systems for mobile devices generally are as fully-featured as those made for desktop or laptop computers.
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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.
Embedded operating systems are designed to be used in embedded computer systems.
A large capacity control valve is actually an assembly of two directional control valves.
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