An auxiliary power unit (APU) is used to charge the first battery to maintain a desired voltage across the first energy storage unit.
以及辅助动力单元，其可操作以给所述第一能量存储单元充电。
An auxiliary power unit (APU) is used to charge the first battery to maintain a desired voltage across the first energy storage unit.
以及辅助动力单元，其可操作以给所述第一能量存储单元充电。
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