GB/T 12690.20-2024 Chinese PDF (GB /T12690.20-2024) GB/T 1406.3-2025 tests and test conditions -

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 13522-2024_Chinese: Bone china (Chinese: 骨质瓷器)

GB/T 17925-2024_Chinese: Practice for X-ray digital radioscopic examination of cylinder weld (Chinese: 气瓶对接焊缝X射线数字成像检测)

GB/T 15316-2024_Chinese: General principles for energy saving monitoring and testing techniques (Chinese: 节能监测技术通则)

GB/T 12690.20-2024 Chinese PDF (GB /T12690.20-2024) GB/T 1406.3-2025 tests and test conditions -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