GB/T 12690.2-2015
ActiveChemical analysis methods for non-rare earth impurity of rare earth metals and their oxides—Part 2: Determination of ignition loss content of rare earth oxides—Gravimetric method
稀土金属及其氧化物中非稀土杂质化学分析方法 第2部分:稀土氧化物中灼减量的测定 重量法
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