“秒长国家计量基准”的概念、定义、翻译、参考文献-科学参考

单词	秒长国家计量基准
释义	秒长国家计量基准 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	ground motion ground nadir point ground navigation phase ground object reflectance spectrum curve ground object spectrum ground object spectrum characterization ground oil storage tanks ground operation and control system ground operator of unmanned aerial vehicle ground penetrating radar ground plane ground positioning orientation and aiming system ground power supply and distribution test equipment ground pressure ground pressure around openings ground pressure around shaft ground pressure in stopes ground pressure management ground propagation ground proximity warning system ground radiation ground receiving station ground receiving station for meteorological satellite ground release test of airborne ground remote sensing

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。