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fittings and flanges for pipeline transportation systems - Part 2: Fittings (Chinese: 石油天然气工业 管道输送系统用弯管、管件和法兰 第2部分：管件)
English versions: GB/T 31032-2023
2-2025_Chinese: Rules for agricultural seed testing - Part 2: Sampling (Chinese: 农作物种子检验规程 第2部分：扦样)
2-2024_Chinese: Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars (Chinese: 钢筋混凝土用钢 第2部分：热轧带肋钢筋)
GB/T 45373-2025_Chinese: Petroleum and liquid petroleum products - Direct measurement of density in tanks - Resonance cylinder densitometer methods (Chinese: 石油和液体石油产品 罐内密度直接测量 谐振筒密度计法)
GB/T 31406-2024 Chinese PDF (GB/T31406-2024) GB/T 15237-2025 fittings and flanges for pipelineGB T 31406 2024_Chinese: Quality requirements for dried meat slice (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 31406 2024
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