GB/T 34877.4-2024 Chinese PDF (GB/T34877.4-2024) GB/T 45447-2025 GB/T 13296-2023_Chinese: Seamless stainless steel

GB/T 13296-2023_Chinese: Seamless stainless steel tubes for boiler and heat exchanger (Chinese: 锅炉、热交换器用不锈钢无缝钢管)

English versions: GBZ37551

4-2025_Chinese: Safety of laser products - Part 4: Laser guards (Chinese: 激光产品的安全 第4部分：激光防护屏)

English versions: GB/T 45637-2025

GB/T 34877.4-2024 Chinese PDF (GB/T34877.4-2024) GB/T 45447-2025 GB/T 13296-2023_Chinese: Seamless stainless steelGB T 34877. 4 2024_Chinese: Industrial fans Determination of fan sound power levels under standardized laboratory conditions Part 4: Sound intensity method (Chinese: 4) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 34877. 4 2024