风险分散的原理是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='26423' and id < 2207724 and id<>'2207724' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26423' and id > 2207724 and id<>'2207724' order by id asc limit 5