【单选题】【消耗次数：1】
关于甲氨蝶呤，下列说法中错误的是（ ）。
①
是二氢叶酸还原酶抑制剂
②
是二氢叶酸合成酶抑制剂
③
强酸条件下的水解产物是谷氨酸和蝶呤酸
④
主要用于治疗急性白血病
⑤
大剂量引起中毒时，可用亚叶酸钙解救
参考答案：
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