Group 1 - The company, Duofu Duo (002407.SZ), responded to an investor inquiry regarding the application of its developed specialty fluorine materials in the aerospace sector, stating that there are currently no relevant business or orders for these materials in that field [2] - The company mentioned that its boron isotope-related products do have applications in aerospace and aviation sectors [2]

Group 1 - The core viewpoint of the article is that Duofluoride (002407.SZ) currently does not have any fluorine material products directly applicable to the aerospace sector, nor any related business or orders [1] - The company has developed boron isotope-related products that have applications in aerospace and other fields [1]