primary frequency standard meaning in English
基本频率标准
一级频率标准
原频率标准
原始频率基准
Examples
- Design amp; amp; preliminary results of nim cesium fountain primary frequency standard
铯原子喷泉频率基准的设计与初步结果 - Introduction to frequency standards and clocks , including atomic clocks and primary frequency standards , quartz oscillators , and other standards
介绍频率标准和时钟，包括原子钟、一等频率标准，石英晶体振荡器和其他标准。