朝阳科技：电影《731》由多家公司或单位出品、联合出品、摄制及发行

Group 1 - The core point of the article is that Chaoyang Technology (002981) is involved in the production and technical support of the film "731" through its subsidiary Feida Audio [1] - The film "731" is produced and co-produced by multiple companies or units, indicating a collaborative effort in the film industry [1] - Feida Audio has reached cooperation with some of the co-producing companies to provide technical support in sound aspects [1]