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English versions: GB/T 33798-2025
19-2025_Chinese: Methods for chemical analysis of tungsten concentrates - Part 19: Determination of fluoride content - Ion selective electrode method (Chinese: 钨精矿化学分析方法 第19部分：氟含量的测定 离子选择电极法)
GB/T 16895
English versions: GB/T 1232
English versions: GB/T 45084-2024
GB 25502-2024 Chinese PDF GB/T 45149-2025 English versions: GB/T 33798-2025GB 25502 2024_Chinese: Minimum allowable values of water efficiency and water efficiency grades for water closets (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 25502 2024
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