基准频率;参考频率
The H maser is an essential frequency reference standard for radio astronomy.
氢脉泽是射电天文所必需的频率标准。
We also describe the basic principle and realization of optical clock, and believe that optical frequency standard will become new generation time frequency reference.
详细描述了光钟的原理与系统构成,并对光学频率标准与光钟的应用前景进行了展望。
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