投资组合的非系统性风险因素为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30642' and id < 2473578 and id<>'2473578' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30642' and id > 2473578 and id<>'2473578' order by id asc limit 5