abnormal return短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 异常返回 Among the empirical part, this paper adopt event study to analysis the cumulative abnormal return in the MBO event windows at first, the result is that there is remarkable cumulative abnormal return; 在实证研究部分中，本文首先采用事件研究法分析了管理层收购事件窗口里的累积超额收益率，分析表明存在显著的超额累积收益率； cnki