关于消毒剂乙醇的描述，以下哪项是错误的()

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【单选题】【消耗次数：1】

① 皮肤、温度计一般消毒常用70％或75％乙醇

② 防压疮常用40％～50％乙醇

③ 物理降温常用20％～30％乙醇

④ 70％～75％的乙醇杀菌作用最强

⑤ 浓度越高，杀菌作用越强

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