超声电子：目前覆铜板供本公司PCB业务自用约占5%

Group 1 - The core point of the article is that ChaoSheng Electronics (000823) has indicated that its self-use of copper-clad laminates for PCB business accounts for approximately 5% of its total usage, with no current plans for expansion in this area [1] Group 2 - As of now, the company does not have any plans to expand its copper-clad laminate business [1] - The company engages in external sales of copper-clad laminates, but the specific percentage of these sales is not disclosed [1]