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The product xylose is identified by silica gel TLC, optical activity measurement and other approval tests.
成品经过薄层层析和旋光测定等鉴定确定为木糖.
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The bi 4π counting method as a new fundamental method of activity measurement is introduced.
本文介绍了一种新的测量放射性活度的计数器及基础测量方法——双4π计数方法.
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。