若复数 （i是虚数单位）的实部和虚部相等，则实数a等于

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24602' and id < 2112020 and id<>'2112020' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24602' and id > 2112020 and id<>'2112020' order by id asc limit 5