粮油检验　小麦粉多酚氧化酶活力的测定　分光光度法
Inspection of grain and oils—Determination of polyphenol oxidase activity in wheat flour—Spectro-photometric method

2017-10-27

钢铁及合金化学分析方法 萃取分离-偶氮氯膦mA分光光度法测定稀土总量
Methods for chemical analysis of iron，steel and alloy--Extraction separation-chlorophosphonazo mA spectro-photometric method for the determination of the total rare earth content

1994-09-26