Lihang Technology received an inquiry letter from the Shanghai Stock Exchange regarding the company's 2023 annual report. The company specializes in aircraft ground support equipment, aircraft testing and inspection equipment, aircraft process equipment, aircraft parts processing and component assembly. According to the annual report, the company's 2023 revenue dropped sharply by 36.55%, and gross margin continued to drop sharply since its listing in March 2022. The gross margins for 2021-2023 were 48.57%, 42.34%, and 13.82%, respectively. The changes in revenue disclosed in the annual report are mainly due to a small number of deliveries and changes in the product sales structure. The company is requested to further disclose: quantitatively analyze the specific reasons for the sharp decline in operating income from changes in product structure, product price, sales volume, etc.; the unit cost composition and reasons for the change in similar products sold in the past three years.