钢管通常长度-GBT 8163-2018与GB T 17395-2008 [课程编码3787]

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GBT 8163-2018 输送流体用无缝钢管ciwoqimuhjlyvrwawezahbjdjkjrunfrpivdgk

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钢管通常长度-

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钢管通常长度-

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GB T 17395-2008 无缝钢管尺寸、外形、重量及允许偏差 标准

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