同兴科技：截至11月底在手订单约2.91亿元，其中工程在手订单约2.25亿元

Group 1 - The core point of the article is that the company, Tongxing Technology, reported its order backlog as of the end of November, amounting to approximately 291 million yuan, with engineering orders constituting about 225 million yuan [2]. Group 2 - The company responded to an investor inquiry on an interactive platform regarding the breakdown of its order backlog, specifically in environmental engineering, catalysts, and absorbents [2].