Behaviour being used: Deferred feedback
Minimum fraction: 0
Maximum fraction: 1
Question variant: 1
Question summary: 电动机是把（ ）能转换成（ ）能的一种设备，其工作原理是磁场对电流受力的作用，使电动机转动。: 热，机械; 电，机械; 化学，机械; 电，热
Right answer summary: 电，机械
Response summary:
Question state: todo