项目质量控制体系运行的核心机制是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25979' and id < 2180561 and id<>'2180561' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25979' and id > 2180561 and id<>'2180561' order by id asc limit 5