航天工程：不涉及商业航天

Group 1 - The core point of the article is that Aerospace Engineering (603698) announced a significant stock price fluctuation, with a cumulative increase of 20% over three consecutive trading days, indicating abnormal trading activity [1] - The company's main business focuses on coal gasification technology, specifically utilizing aerospace pressurized gasification technology [1] - Aerospace Engineering is engaged in the research and development, engineering design, technical services, equipment supply, and general contracting related to gasification technology and key equipment, without involvement in commercial aerospace [1]