PCB板块盘初调整，超声电子触及跌停

Group 1 - The PCB sector experienced an initial adjustment, with significant declines in stock prices [1] - Ultrasonic Electronics hit the daily limit down, indicating a severe drop in its stock value [1] - Other companies such as Junya Technology, Benchuan Intelligent, Feiliwa, Aohong Electronics, Rongda Photosensitive, and Zecheng Electronics also saw declines in their stock prices [1]