题目内容
Without an operating system, a user can not run an application program on their computer.
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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.
在第八届世界健美操锦标赛中，中国队的（ ）获得第三名，首次在世界锦标赛上升起了五星红旗，实现了中国健美操历史上奖牌零的突破。
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