GB/T 23031.5-2023 Chinese PDF (GB/T23031.5-2023) GB 7512-2023 GB/T 28572-2025_Chinese: Specification and technical

GB/T 28572-2025_Chinese: Specification and technical parameters of inlet valves for large and medium-sized hydraulic turbines (Chinese: 大中型水轮机进水阀门规格及技术参数)

1-2023_Chinese: Buried polyethylene(PE) piping systems for the supply of gaseous fuels - Part 1: General (Chinese: 燃气用埋地聚乙烯（PE）管道系统 第1部分：总则)

2-2025_Chinese: Specification of intellectual property appraisement - Part 2: Patent (Chinese: 知识产权鉴定规范 第2部分：专利)

English versions: GB 29449-2024

GB/T 23031.5-2023 Chinese PDF (GB/T23031.5-2023) GB 7512-2023 GB/T 28572-2025_Chinese: Specification and technicalGB T 23031. 5 2023_Chinese: Industrial internet platform Application and implementation guide Part 5: Customization (Chinese: 5) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 23031. 5 2023