“international recommended values of standard frequencies”的概念、定义、翻译、参考文献-科学参考

单词	international recommended values of standard frequencies
释义	international recommended values of standard frequencies Encyclopedia 工学时间频率计量释 international recommended values of standard frequencies国际标准频率推荐值由国际计量委员会（CIPM）推荐的一组电磁辐射标准频率值。为包含实际复现米定义和秒的次级表示在内的应用而设立。
随便看	contractive coefficient contractive factor contractive linear operator contractive mapping contractive-mapping principle contractive operator contractive operator-valued function contractive semi-group contractive semigroup contractivity contract law Contract Law of the People's Republic of China contract learning contract management of water conservancy project contract management system contract of charter party contract of novation contract of towage by sea contract of transferring land use right by government and by non-government contractor contractor liability insurance contractor logistics support of aircraft equipment contractor safety management system contract postgraduate contract purchase

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