“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	o-benzenetriol o benzoquinone o-benzoquinone OBEP Oberhausen Manifesto Oberlin Theology Oberon Oberth crater obese gene obesity obesity-related glomerulopathy，ORG Obi Egbuna obinutuzumab Object object object and scene simulation object and subject object angle object-based modeling object-based storage device and system object-based storage system object beam object bus object capturing object characteristic identification

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。