某工程发生质蛩事故导致12人重伤，按照事故伤亡的程度分级，该质量事故属于().

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25928' and id < 2176292 and id<>'2176292' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25928' and id > 2176292 and id<>'2176292' order by id asc limit 5