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The preparation and purification methods of pyridine hydrochloride were discoursed in the paper.
本文叙述了盐酸吡啶的制备及精制方法.
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The separation and purification methods for astragalus polysaccharides are introduced and analyzed in this paper.
介绍和分析黄芪多糖的分离和纯化方法.
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。