... 合金钢制管卡 Steel Pipe Clamp 焊接低合金碳钢管 alloy pipe and tubes 热交换器用铜合金无缝管 exchanger ...
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welded carbon low-alloy pipe and tubes
... nonferrous metals 非铁金属 welded carbon low-alloy pipe and tubes 焊接低合金碳钢管 of values factor K 系数K值 ...
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