下列（ ）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='29831' and id < 2422429 and id<>'2422429' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29831' and id > 2422429 and id<>'2422429' order by id asc limit 5