A股午评：创业板指跌1.74%，超2900股下跌，贵金属、AI应用方向集体调整

Market Performance - The three major A-share indices showed mixed performance in the morning session, with the Shanghai Composite Index closing flat at 4067.67 points [1] - The Shenzhen Component Index fell by 0.92%, while the ChiNext Index decreased by 1.74%, and the North Star 50 Index dropped by 1.19% [1] - The total trading volume in the Shanghai and Shenzhen markets reached 162.97 billion yuan, an increase of 12.7 billion yuan compared to the previous day [1] - Over 2900 stocks in the market experienced declines [1] Sector Performance - The coal, photovoltaic equipment, and real estate sectors showed strength in the morning session [1] - In contrast, the precious metals and AI application sectors collectively adjusted downwards [1]