QB/T 1914-2013
Determination of mean relative molecular weight of alkyltrimethylammonium halide and alkyldimethylbenzylammonium halide by GC
GB/T 6730.34-2017(\u82f1\u6587\u7248)
铁矿石 锡含量的测定 邻苯二酚紫-溴化十六烷基三甲胺分光光度法
QB/T 1914-1993