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当换挡杆位于B档位，松开油门踏板，踩下刹车踏板，车辆处于减速状态，混合动力系统将( ) 产生的部分电能提供给 MG1。通过 ( )使发动机不喷油的状况下怠速运转，并利用发动机转动阻力向车轮施加发动机制动。

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