鑫科材料：公司是铜铬锆带材产品，主要用于大电流连接器

Group 1 - The core point of the article is that Xinke Materials (600255.SH) clarified that their copper-chromium-zirconium alloy products are primarily used for high-current connectors, such as charging piles and resistance welding, rather than for rocket engine materials [2][2][2] Group 2 - The company responded to an investor inquiry regarding the application of their copper-chromium-zirconium alloy, stating that it has been certified as an internationally advanced and leading material [2][2][2]