维生素Bl2治疗小儿营养性巨幼细胞性贫血无效，首先考虑可能的原因是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='28353' and id < 2319085 and id<>'2319085' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28353' and id > 2319085 and id<>'2319085' order by id asc limit 5