GBT 985.1-2008 气焊、焊条电弧焊、气体保护焊和高能束焊的推荐坡口.pdf
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2010-1/GBT 985.1-2008 气焊、焊条电弧焊、气体保护焊和高能束焊的推荐坡口.rar 2010-1/GBT 985.1-2008 gas welding, arc welding, gas welding and beam welding of the recommended groove. Rar
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2010-1/GBT 985.1-2008 气焊、焊条电弧焊、气体保护焊和高能束焊的推荐坡口.rar 2010-1/GBT 985.1-2008 gas welding, arc welding, gas welding and beam welding of the recommended groove. Rar