海鸥住工：江西鸥迪铜业有限公司是公司的联营企业，持股比例为29%

Group 1 - The core viewpoint of the article is that Jiangxi Oudi Copper Industry Co., Ltd., a joint venture of the company, is involved in the manufacturing and sales of non-ferrous metal alloys and other related products [2] - The company holds a 29.00% stake in Jiangxi Oudi Copper Industry Co., Ltd., which primarily engages in non-ferrous metal rolling processing and manufacturing [2] - The business activities of Jiangxi Oudi include the sale and manufacturing of metal materials, as well as the production of construction decoration, plumbing parts, and other metal products for construction [2]