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

单词	primary frequency standard
释义	primary frequency standard Encyclopedia 工学【电子计量】释 primary frequency standard频率基准直接复现秒定义的测量装置。又称秒长基准。
随便看	spatial circular frequency spatial cluster analysis spatial cluster rule spatial cognition spatial coherence spatial coherence of light spatial competition theory spatial cone spatial configuration spatial content spatial coordinate spatial coordinate transformation spatial correlation spatial correlation analysis spatial correlation function spatial crystallographic group spatial curve spatial curvilinear web spatial data spatial data access spatial data acquisition spatial data assimilation spatial database spatial database engine spatial database management system

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。