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GB/T 34020.1-2017 Double wall copper-brazed steel tubes—Part 1:Tubing system for refrigerator 双层卷焊钢管 第1部分：冰箱管路系统用管 - 中英文版 |
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GB/T 34020.2-2017 Double wall copper-brazed steel tubes—Part 2:Tubing system for automobiles 双层卷焊钢管 第2部分：汽车管路系统用管 - 中英文版 |
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GB/T 34020.3-2017 Double wall copper-brazed steel tubes—Part 3: Tubing system for air conditioner and refrigeration 双层卷焊钢管 第3部分：空调和制冷设备管路系统用管 - 中英文版 |
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