GB/T 12690.20-2024 Chinese PDF (GB /T12690.20-2024) GB/T 1406.3-2025 GB 23394-2024_Chinese: Respiratory protection -

GB 23394-2024_Chinese: Respiratory protection - Positive pressure self-contained closed-circuit compressed oxygen breathing apparatus (Chinese: 呼吸防护 正压式自给闭路压缩氧气呼吸器)

English versions: GB/T 18910

GB/T 15370

English versions: GB/T 17670-2025

tests and test conditions - Part 41: Energy registration methods and requirements for multi-energy and multi-rate meters (Chinese: 电测量设备 通用要求、试验和试验条件 第41部分：多电能和多费率仪表的电能计度方法和要求)

GB/T 12690.20-2024 Chinese PDF (GB /T12690.20-2024) GB/T 1406.3-2025 GB 23394-2024_Chinese: Respiratory protection -GB T 12690. 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: 20 ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 12690. 20 2024