“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	isotopic abundance isotopically labeled compound isotopically labelled reagent isotopically modified compound isotopically substituted compound isotopically unmodified compound isotopic analog state isotopic analysis isotopic braids isotopic carrier isotopic chrono1ogy isotopic cluster ion isotopic composition isotopic content isotopic correlation safeguards technique isotopic dating isotopic deformation isotopic diffeomorphism isotopic differential embedding isotopic dilution mass spectrometry isotopic dilution mass spectrometry (IDMS) isotopic distribution isotopic effect isotopic effect of precipitation isotopic element

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。