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.
压簧机械由主机，控制系统，电机动力单元，辅助装置，附属设备组成。
Pressure spring machine is composed of main machine, control system, motor power unit, auxiliary device and auxiliary equipment.
压簧机械由主机，控制系统，电机动力单元，辅助装置，附属设备组成。
Pressure spring machine is composed of main machine, control system, motor power unit, auxiliary device and auxiliary equipment.
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