Group 1 - Company SanDa Membrane announced the appointment of Mr. Zhang Jingxiao as the co-securities representative [1] - For the year 2024, SanDa Membrane's revenue composition is as follows: membrane technology applications account for 53.09%, water investment and operation account for 42.1%, and construction revenue accounts for 4.81% [1] Group 2 - As of the report, SanDa Membrane has a market capitalization of 5.7 billion yuan [2]