昔日绩优股今安在？ 一般意义上说，高收益和高净资产收益率是绩优股的两大基本特征。日前，上海新兰德研究中心对１９９６年至２０００年的５年时间内沪深两市绩优股作了分类统计。统计数据表明，在五年时间内，能连续进入绩优股前十名的公司不多见。以沪市为例。１９９７年上 Past blue chip stocks today? In a general sense, high yield and return on high net assets are two basic characteristics of blue chip stocks. Recently, Shanghai New Land Research Center made a classification of the blue-chip stocks in Shanghai and Shenzhen over the five-year period from 1996 to 2000. Statistics show that in five years time, continuous access to the top ten blue chip companies rare. Take Shanghai Stock Market for example. In 1997