“卖出美国”交易抬头，美股三大股指开盘走低，英伟达盘初跌超2%

Group 1 - Moody's downgrade of the US credit rating has led to significant volatility in the US capital markets, with the Nasdaq dropping 1.37%, the S&P 500 down 1.04%, and the Dow Jones falling 0.67% [1] - Major tech stocks have mostly declined, with Nvidia falling over 2% as the company prepares to launch its next-generation GB300 AI system in Q3, Apple down 1.55%, and Tesla dropping over 3% [1] - US Treasury yields have continued to rise, with the 30-year Treasury yield reaching 5.02% during intraday trading [1]