GB/T 23031.5-2023 Chinese PDF (GB/T23031.5-2023) GB 7512-2023 1-2023_Chinese: Buried polyethylene(PE) piping systems

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)

English versions: GB/T 18916

24-2025_Chinese: Methods for chemical analysis of magnesium and magnesium alloys - Part 24: Determination of trace impurity elements contents - Glow discharge mass spectrometry (Chinese: 镁及镁合金化学分析方法 第24部分：痕量杂质元素的测定 辉光放电质谱法)

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)

trailers and combination vehicles mass parameters measurement method (Chinese: 汽车、挂车及汽车列车质量参数测量方法)

GB/T 23031.5-2023 Chinese PDF (GB/T23031.5-2023) GB 7512-2023 1-2023_Chinese: Buried polyethylene(PE) piping systemsGB 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