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【多选题】
图中A为交流发电机,B为直流发电机,下列判断正确的是A.
交流发电机和直流发电机主体结构上很像，都包括磁铁、线圈和滑环
B.
交流发电机和直流发电机主要的一点区别是，交流发电机是两个完整的滑环，直流发电机是两个半个的滑环
C.
交流发电机所产生电流的方向在不断改变
D.
直流发电机所产生电流的方向固定不变
E.
直流发电机可以直接给蓄电池充电，而交流发电机整流后给蓄电池充电
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