“national prototype of the kilogram”的概念、定义、翻译、参考文献-科学参考

单词	national prototype of the kilogram
释义	national prototype of the kilogram Encyclopedia 工学质量计量技术释 national prototype of the kilogram1千克质量基准砝码中国在1965年从国际计量局得到砝码器号是60号的国家千克原器。
随便看	valence crystal valence deflection angle valence electron valence electron approximation valence fluctuation valence instability valence isomerism valence-matching principle valence nucleon valence number valence of an atom valence quark valence shell electron pair repulsion valence shell electron pair repulsion theory valence-shell electron-pair repulsion theory valence shell electron pair repulsion theory, VSEPR valence state valence tautomerism valence tautomerization valence universal approach valence, valency Valencia valency valency coefficient valency dictionary

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。