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比较一下HGU-TO与2XSPTGD增长率的误差:可见HGU-TO随时间推移比较2XSPTGD的增长率误差越来越大(滞后),其误差有积分(累积)效应. 长线投资,增长率有可能大大滞后2XSPTGD

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