下列选项中，属于左心结构的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30849' and id < 2484564 and id<>'2484564' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30849' and id > 2484564 and id<>'2484564' order by id asc limit 5