动力源：上市公司及控股子公司对外担保总额为人民币约1.74亿元

Group 1 - The company, Dongliang (SH 600405), announced a total external guarantee amount of approximately RMB 174 million as of the announcement date [2] - The company provided guarantees totaling approximately RMB 142 million to its controlling subsidiaries, which represent 47.79% and 38.92% of the company's most recent audited net assets, respectively [2] - For the year 2024, the company's revenue composition is as follows: data communication accounts for 35.2%, power supply for 23.65%, comprehensive energy saving for 15.02%, new energy for 12.7%, and components for new energy vehicles for 9.91% [2]