A股午评：三大指数集体调整，沪指跌0.56%创业板指跌0.43%北证50跌2.14%，电池、煤炭领跌，AI应用走强！超4000股下跌，成交12962亿放量179亿

Market Overview - The three major A-share indices collectively declined in the morning session, with the Shanghai Composite Index down 0.56% to 3949.83 points, the Shenzhen Component Index down 0.43%, and the ChiNext Index also down 0.43% [1] - The North Star 50 Index experienced a more significant drop of 2.14% [1] - The total trading volume in the Shanghai and Shenzhen markets reached 1.2962 trillion yuan, an increase of 17.9 billion yuan compared to the previous day [1][2] Sector Performance - The battery, coal, and chemical sectors saw the largest declines [1] - In contrast, the AI corpus and cultural media sectors showed strong performance [1]