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GB/T 18115.2-2020
稀土金属及其氧化物中稀土杂质化学分析方法 第2部分:铈中镧、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥和钇量的测定
Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 2: Determination of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yt
GB/T 15000.2-2019
Directives for the work of reference materials—Part 2:Selected terms and definitions
GB/T 15000.4-2019
Directives for the work of reference materials—Part 4:Contents of certificates,labels and accompanying documentation
GB/T 19837-2019
Ultraviolet (UV) disinfection equipment for urban water and wastewater engineering
GB/T 25341.2-2019
Quality of railway passenger transport service—Part 2:Service process
GB/T 38317.21-2019
Space and fixing dimensions for smart electricity meter—Part 21: Structure of A-type
GB/T 5373-2019
Measuring method of dimensions and masses parameter for motorcycles and mopeds