胃大部切除后出现巨幼红细胞性贫血，是由于下列 哪种物质吸收障碍所致（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25934' and id < 2179368 and id<>'2179368' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25934' and id > 2179368 and id<>'2179368' order by id asc limit 5