time and frequency standard 时间频率标准 ; 时间和频率标准
primary time and frequency standard 原级时频标准
CESIUM TIME AND FREQUENCY STANDARD 铯原子钟
frequency and time standard 频率及计时间标准
Standard time and frequency 标准时间和频率 ; 标准时间频率
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。
High precision quartz oscillators were used for the transmission of BPV standard frequency and time signals at Shanghai Observatory.
在上海天文台BPV标频和时间信号的发播工作中，使用了高精度石英晶体振荡器。
Atomic frequency Standard is the frequency and time benchmark of space technology and time awarding system, directly determining the quality of satellite communications.
原子频标是空间技术和授时系统的频率与时间基准，直接决定了卫星通信的质量。
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