PCB概念午后走低

Group 1 - The PCB sector experienced a decline in the afternoon trading session on July 31, with significant drops in stock prices [1] - Shijia Photon saw a nearly 10% decrease in its stock price, indicating a notable downturn in investor sentiment [1] - Other companies in the PCB sector, including Changxin Bochuang, Taicheng Guang, Pengding Holdings, and Hengtong Optic-Electric, also experienced declines in their stock prices [1]