“hydrogen maser”的概念、定义、翻译、参考文献-科学参考

单词	hydrogen maser
释义	hydrogen maser Encyclopedia 工学频率标准释 hydrogen maser氢钟以氢原子基态两个超精细能级间跃迁频率为参考（频率为1.420405751786吉赫兹），通过锁定环路来锁定晶体振荡器，使晶体振荡器能够输出高稳定度和高准确度时间频率信号的原子钟。氢钟采用的工作原子为氢原子，又称氢原子频率标准（简称氢频标）、氢原子钟。 Astronomy hydrogen maser氢微波激射
随便看	opera costumes and paraphernalia opera costumes of Chunlin Troupe of Shangyuan Village, Xiushui County opera costumes of the Qing Dynasty preserved in the Youth Peking Opera Troupe of Tianjin City opera deities Opera Department of Shanghai Theatre National Salvation Association opera ending opera face paintings of Ming and Qing dynasties collected in the Zhuiyu Chamber of Mei clan Opera Facial Makeups for Clowns opera facial mask opera facial paintings of the Qing court opera feature film opera film Opera film director's technique course Opera Film theory opera frescoes at Peking Jingzhong Assosiation opera frescoes unearthed at Yuan tomb of XilizhuangVillage, Yuncheng City opera guild opera house opera house in Guangdong Guild Hall(Tian Jin) opera house in Lanzhou Baiyun Taoist Temple opera house in the City God Temple of New Jiangxian County opera imaginativeness Opera Improvement Bureau of the Ministry of Culture Opera Improvement Committee of the Ministry of Culture opera manuscripts and block-printed editions

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