湖南海利：子公司长沙科成高分子材料有限公司主要从事航空、航天配套新材料和轨道交通配件产品的开发和生产

Group 1 - The core viewpoint of the article is that Hunan Haili (600731) has a subsidiary, Changsha Keceng Polymer Materials Co., Ltd., which focuses on the development and production of new materials for aerospace and rail transportation components, although its scale within the company's business system is relatively small [1]