矩阵是正定的。(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3328' and id < 257443 and id<>'257443' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3328' and id > 257443 and id<>'257443' order by id asc limit 5