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GB/T 20405
20-2024_Chinese: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 20: Determination of minor amounts of fluorine and chlorine in rare earth oxides - Ion chromatography method (Chinese: 稀土金属及其氧化物中非稀土杂质化学分析方法 第20部分：稀土氧化物中微量氟、氯的测定 离子色谱法)
GB/T 22248-2025_Chinese: Determination of glycyrrhizic acid in health foods (Chinese: 保健食品中甘草酸的测定)
English versions: GB/T 18216
English versions: GB/T 17626
GB/T 20840.99-2025 Chinese PDF (GB /T20840.99-2025) GB 45669.3-2025 GB/T 20405GB T 20840. 99 2025_Chinese: Instrument transformers Part 99: Glossary (Chinese: 99) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20840. 99 2025
