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China Bidirectional metal GB Standards Search Result

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GB/T 239.2-2023
Metallic materials - wire rods - Part 2: Test methods for bidirectional torsion
金属材料 线材 第2部分:双向扭转试验方法 - 英文版
GB/T 37828-2019
Bidirectional metal to metal sealed butterfly valve for urban heating
城镇供热用双向金属硬密封蝶阀 - 英文版

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