GB/T 3939.2-2023 Chinese PDF (GB/T3939.2-2023) GB/T 20972.3-2025 maintenance and improvement of a

maintenance and improvement of a GB/T 23331 energy management system (Chinese: 能源管理体系 实施、保持和改进GB/T 23331能源管理体系指南)

GB/T 13930-2024_Chinese: Water ring vacuum pumps and compressors - Method for measurement of volume flow of gas (Chinese: 水环真空泵和水环压缩机 气量测定方法)

English versions: GB 14102

GB/T 45015-2024_Chinese: Technical specifications for comprehensive utilization of titanium gypsum (Chinese: 钛石膏综合利用技术规范)

GB/T 3939.2-2023 Chinese PDF (GB/T3939.2-2023) GB/T 20972.3-2025 maintenance and improvement of aGB T 3939. 2 2023_Chinese: Nomenclature and signs of main fishing gear material Part 2: Netting (Chinese: 2) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 3939. 2 2023