甲氨蝶昤中毒时可使用亚叶酸钙进行解救, 其目的是提供（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24972' and id < 2127450 and id<>'2127450' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24972' and id > 2127450 and id<>'2127450' order by id asc limit 5