GB/T 15231-2023 Chinese PDF (GB/T15231-2023) GB 5009.31-2025 GB/T 13929-2024_Chinese: Water ring vacuum

GB/T 13929-2024_Chinese: Water ring vacuum pumps and compressors - Testing method (Chinese: 水环真空泵和水环压缩机 试验方法)

40-2024_Chinese: Specifications for optical fibre test methods - Part 40: Measurement methods and test procedures for transmission characteristics - Attenuation (Chinese: 光纤试验方法规范 第40部分：传输特性的测量方法和试验程序 衰减)

English versions: GB/T 45238-2025

GB 20997-2024_Chinese: Limits and targets of fuel consumption for light-duty commercial vehicles (Chinese: 轻型商用车辆燃料消耗量限值及评价指标)

GB/T 12940-2023_Chinese: Technical specification for silver-graphite electrical contacts (Chinese: 银石墨电触头技术条件)

GB/T 15231-2023 Chinese PDF (GB/T15231-2023) GB 5009.31-2025 GB/T 13929-2024_Chinese: Water ring vacuumGB T 15231 2023_Chinese: Test methods for the properties of glassfibre reinforced cement (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 15231 2023