甲购买乙的旧电脑，双方订立了合同。甲和乙之间成立 (   )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26675' and id < 2220559 and id<>'2220559' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26675' and id > 2220559 and id<>'2220559' order by id asc limit 5