【单选题】【消耗次数：1】
关于DC/DC工作条件及判断下列不正确的是（）
①
高压输入范围为DC290V~420V
②
?整车处于ON电状态，蓄电池端电压在13.8~14V之间
③
?通过使用水冷进行降温。
④
?低压使能输入范围为DC 9V~14V
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