“national primary frequency standard”的概念、定义、翻译、参考文献-科学参考

单词	national primary frequency standard
释义	national primary frequency standard Encyclopedia 工学频率标准释 national primary frequency standard秒长国家计量基准直接复现秒定义的实验装置。输出的标准频率具有最高计量学特性，作为统一全国秒长量值（频率量值）最高依据的计量器具，全国只有一套。
随便看	stationary point process stationary policy stationary potential stationary probability stationary process stationary process with independent increments stationary prominence flare stationary radiant stationary random discrete signal stationary random process stationary random vibration stationary satellite stationary satellite camera stationary satellite-camera stationary Schrodinger equation stationary Schrödinger equation stationary semigroup stationary sequence stationary set stationary shell stationary shoulder friction stir welding stationary singular point stationary solution stationary source stationary source of air pollution

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。