单选题DC generators are classified according to the manner in which（）Athey are usedBthe field windings are connected to the loadCthe armature circuit is connected to the loadDthe field windings are connected to the armature circuit
单选题
DC generators are classified according to the manner in which（）
A
they are used
B
the field windings are connected to the load
C
the armature circuit is connected to the load
D
the field windings are connected to the armature circuit
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