“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	backswept back-testing backthrust back titration Back to 1942 back to back Back to Back, Face to Face Back to Country Life Back to Methuselah Back to Spring Back to The Future Back to the Origin of Poetry backtracking backtracking line search Backtracking Organization Backtracking Search backtracking strategy search backup backup and recovery back-up battery back-up boar backup cache backup landing site backup manager backup power of fuel cell

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。