13:02！突然跳水，发生了什么？

Market Overview - On July 31, A-shares experienced a significant decline after several days of gains, with the Shanghai Composite Index dropping by 1.18%, the Shenzhen Component Index by 1.73%, and the ChiNext Index by 1.66% [2][3] - The total trading volume reached approximately 845.89 billion, with 1,061 stocks rising and 4,287 stocks falling [5] Sector Performance - The innovation drug concept stocks continued to show strength, with companies like Nanjing New Pharmaceutical and Anke Bio reaching their daily limit [7] - Computing power concept stocks were active despite the market downturn, with stocks such as Yingwei Ke and Chuanrun shares hitting their daily limit [8] Declining Stocks - Cyclical stocks, including steel and coal, collectively adjusted, with Baogang Co. and Anyang Steel both falling over 7% [10][12] - Notable declines included Baogang Co. down by 7.88% and Anyang Steel down by 7.51% [12] News Impacting the Market - The market's sudden drop was attributed to reports of serious security issues with NVIDIA's computing power chips, leading to a government inquiry regarding the safety risks associated with the H20 chip sold to China [13] - NVIDIA's stock price fell in after-hours trading following these revelations, and the company had previously reported a $4.5 billion impairment on unsold H20 chips [15] - The Chinese Ministry of Commerce held a press conference discussing recent economic talks with the U.S., indicating ongoing dialogue on trade relations [15][16]