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

单词	time and frequency primary standard
释义	time and frequency primary standard Encyclopedia 工学【电子计量】释 time and frequency primary standard时间频率基准直接复现秒定义的测量装置。
随便看	Yiyuan Bianbiandong Yi Yuanji Yiyuan Shenqing Temple Pinus densiflora Yiyuan Xian Yiyue Yiyun Library Yi Zeng Yizhang Xian Yizheng-Changling Oil Pipeline Yizheng-Jinling Oil Pipeline Yizheng Museum Yizheng Shi Yi Zhenji Yizhichan pushing manipulation Yi Zhou Yizhou Yizhou Qu Yizong Jinjian Y-joint Ykaterina Maximova YLE ylem ylide ylide complex Y-linked inheritance

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。