同质风险是指（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25171' and id < 2135352 and id<>'2135352' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25171' and id > 2135352 and id<>'2135352' order by id asc limit 5