A股主要指数冲高回落，沪指翻绿，深成指跌近0.35%！PEEK材料、光刻机、燃气等方向跌幅居前，近3200只股票下跌

Group 1 - The A-share major indices experienced a pullback after initially rising, with the Shanghai Composite Index turning negative and the Shenzhen Component Index declining by nearly 0.35% [1] - The sectors that saw the largest declines included PEEK materials, lithography machines, and gas, indicating a broad market weakness [1] - Approximately 3,200 stocks in the Shanghai, Shenzhen, and Beijing markets fell, reflecting a significant downturn in market sentiment [1]