【单选题】【消耗次数：1】
对于整车控制器VCU说法正确的是（）
①
实现对支路用电器的保护及切断
②
通过化学反应把化学能直接转变成低压直流电能的装置
③
使用的是340V的直流高压电
④
使用的是12V的直流低压电
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