“primary standard”的概念、定义、翻译、参考文献-科学参考

单词	primary standard
释义	primary standard [`prī´mer·ē `stan·dǝrd] ^{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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