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

单词	national primary frequency standard
释义	national primary frequency standard Encyclopedia 工学频率标准释 national primary frequency standard秒长国家计量基准直接复现秒定义的实验装置。输出的标准频率具有最高计量学特性，作为统一全国秒长量值（频率量值）最高依据的计量器具，全国只有一套。
随便看	chloral hydrate chlor-alkali industry chlorambucil chloramine T chloramphenicol chloramphenicol antibiotic chloramphenicols chloranthus family chlorantraniliprole chlorargyrite chlorate solution leaching pre-process of gold mineral material chlorbenzuron chlordane chlordecone chlorella Chlorella pyrenoidesa chlorfenvinphos chlorfluazuron chloric acid chloride cell chloride-ion battery chloride sensitive crops chloride toxicity of plants chloridizing leaching in solution of gold mineral material chloridizing leaching of gold at heat-pressure

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