调整计划外负荷增加而设置的备用是(  )。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69416' and id < 4494585 and id<>'4494585' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69416' and id > 4494585 and id<>'4494585' order by id asc limit 5