英语词汇“primary standard”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	primary standard
释义	primary standard primary standard [′prī‚mer·ē ′stan·dərd] (science and technology) A unit directly defined and established by some authority, against which all secondary standards are calibrated; for example, in analytical chemistry, reference substances or solutions of known chemical purity and concentration are used to standardize laboratory solutions prior to volumetric analysis or titration.
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英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。