下列药物中通过抑制二氣叶酸还原酶而 发挥疗效的有（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27505' and id < 2270013 and id<>'2270013' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27505' and id > 2270013 and id<>'2270013' order by id asc limit 5