()是使某一投资的期望现金流人现值等于该投资的现金流出现值的收益率，也可定 义为使该投资的净现值为零的折现率。[2017年5月二级真题]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25280' and id < 2138903 and id<>'2138903' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25280' and id > 2138903 and id<>'2138903' order by id asc limit 5