财报乐观助力美股周二高开; 标普500指数开盘上涨8.03点,涨幅0.28%,报2913.61点; 纳斯达克指数开盘上涨24.80点,涨幅0.31%,报8000.79点; 道琼斯指数开盘上涨127.50点,涨幅0....

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