项目复杂性、规模和结构的不确定性属于（）风险。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30131' and id < 2441931 and id<>'2441931' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30131' and id > 2441931 and id<>'2441931' order by id asc limit 5