A股三大指数开盘涨跌不一，寒武纪低开近7%

Group 1 - The Shanghai Composite Index opened down 0.02%, while the Shenzhen Component Index also opened down 0.02%, and the ChiNext Index opened up 0.03% [1] - Cambrian Technology opened down 6.8% after warning investors about increased trading risks and denying plans for new product launches [1] - Cambrian Technology expects annual revenue to be between 5 billion to 7 billion RMB [1] Group 2 - SMIC opened down 4.4% [1]