GB/T 25138-2024 Chinese PDF (GB/T25138-2024) GB/T 4706.32-2024 GB/T 45355-2025_Chinese: Polyethylene(PE) piping systems

GB/T 45355-2025_Chinese: Polyethylene(PE) piping systems for non-pressure buried drainage and sewerage (Chinese: 无压埋地排污、排水用聚乙烯（PE）管道系统)

GB/T 43271-2023_Chinese: Wood identification - DNA barcoding method (Chinese: 木材鉴定 DNA条形码方法)

English versions: GB/T 29899-2024

GB/T 31036-2025_Chinese: Proton exchange membrane fuel cell backup power system - Safety (Chinese: 质子交换膜燃料电池备用电源系统 安全)

GB/T 25138-2024 Chinese PDF (GB/T25138-2024) GB/T 4706.32-2024 GB/T 45355-2025_Chinese: Polyethylene(PE) piping systemsGB T 25138 2024_Chinese: Standard silica sand for checking foundry binder (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 25138 2024