下列哪种物质是制造血红蛋白必需的

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30846' and id < 2484278 and id<>'2484278' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30846' and id > 2484278 and id<>'2484278' order by id asc limit 5