GB/T 31239-2023 Chinese PDF (GB/T31239-2023) GBZ37551.4-2025

GB/T 31239-2023 Chinese PDF (GB/T31239-2023) GBZ37551.4-2025GB T 31239 2023_Chinese: Technical specification for fittings of 1 000 kV substation (Chinese: 1000kV) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 31239 2023

English versions: GB/T 2820

1-2025_Chinese: Test methods of rare earth phosphors for LED - Part 1: Determination of spectrum (Chinese: LED用稀土荧光粉试验方法 第1部分：光谱的测定)

4-2024_Chinese: Mineral and sapphire watch-glasses - Part 4: Anti-reflective treatment (Chinese: 无机和蓝宝石手表玻璃 第4部分：减反射处理)

GB/T 5483-2024_Chinese: Natural gypsum (Chinese: 天然石膏)

English versions: GB/T 45000-2024

and locating guide bushes

GB/T 26925-2025_Chinese: Water saving enterprises - Fossil fired plant (Chinese: 节水型企业 火力发电行业)

English versions: GB/T 32234

GB/T 20236-2025_Chinese: Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight (Chinese: 非金属材料的聚光加速户外暴露试验方法)

English versions: GB/T 37027-2025

5-2025_Chinese: Remote handling devices for radioactive materials - Part 5: Remote handling tongs (Chinese: 放射性物质远程操作装置 第5部分：剑式机械手)

GB/T 20656-2023_Chinese: Petroleum and natural gas industries - Field inspection of new casing