The electric power monitoring system is a complex distributing system, and there is different demand on clock synchronization precision in different levels.
电力监测系统是一个复杂的分布式系统，对时钟同步精度有着不同层次的需求。
The clock electric circuit is playing the extremely vital role in the computer system, is guarantees the system normal work the foundation.
时钟电路在计算机系统中起着非常重要的作用，是保证系统正常工作的基础。
The clock signal provided by Global Positioning system GPS is widely used as a synchronous clock in broadcasting television system and electric power system and the display of time in public.
GPS卫星同步时钟广泛用作广播电视、电力等系统的同步时钟及车站、机场等公共场所的时间显示。
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