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开坯孔型
把方形或矩形的大断面钢锭或钢坯轧成小断面的方坯或板坯,使轧件的断面面积缩小,长度增加,为后面孔型提供合适轧件尺寸的孔型。又称延伸孔型。
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Art Museum of Shanghai Oil Painting Sculpture Institute
Art Museum of Sichuan Fine Arts Institute
Art Newspaper of China
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art nouveau
Art Nouveau furniture
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