JB/T 6237.4-1992
电触头用银粉化学分析方法 2-(5-溴-2-吡啶偶氨)-5-二乙氨基苯酚分光光度法测定镍量
Silver powder chemical analysis method for electrical contacts 2-(5-bromo-2-pyridylamido)-5-diethylaminophenol spectrophotometric determination of nickel content
JBT6237.4-1992, JB6237.4-1992