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The first 20 elements
The first 20 elements, Total:2 items.
In the international standard classification, The first 20 elements involves: Metalliferous minerals, Applications of information technology.
国家市场监督管理总局、中国国家标准化管理委员会, The first 20 elements
- GB/T 14352.20-2021 Methods for chemical analysis of tungsten ores and molybdenum ores—Part 20：Determination of niobium, tantalum, zirconium, hafnium and 15 rare earth elements content—Inductively coupled plasma mass spectrometry
German Institute for Standardization, The first 20 elements
- DIN EN 61987-13:2016 Industrial-process measurement and control - Data structures and elements in process equipment catalogues - Part 13: Lists of properties (LOP) for Pressure Measuring Equipment for electronic data exchange (IEC 61987-13:2016); German version EN 61987-13:20