frequency time standard 频率时间标准
time and frequency standard 时间频率标准 ; 时间和频率标准
frequency and time standard 频率及计时间标准
primary time and frequency standard 原级时频标准
Standard time and frequency 标准时间和频率 ; 标准时间频率
CESIUM TIME AND FREQUENCY STANDARD 铯原子钟
time and frequency primary standard 时间频率基准
standard time-frequency broadcast 标准时间频率发布
frequency alias and time standard 频率及计时间标准
This is the basis for the well - known cesium clock, presently the standard of frequency and time.
这就是众所周知的铯原子钟的基础，它是目前的频率和时间基准。
China digital television terrestrial broadcasting standard GB20600-2006 is based on TDS-OFDM (Time-Domain Synchronous orthogonal Frequency Division Multiplexing) systems.
中国地面数字电视广播标准GB20600 - 2006是基于时域同步-正交频分复用(TDS - OFDM)系统的。
A new tool that can test the clock base frequency error of energy measuring devices and provide GPS standard time to calibrate real-time clock was introduced in this paper.
介绍了一种用来测量电能计量装置的时钟基频误差，并提供GPS标准时间以校准其实时时钟的新型工具。
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