下列各项，在血液运行中起关键作用的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28493' and id < 2326514 and id<>'2326514' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28493' and id > 2326514 and id<>'2326514' order by id asc limit 5