The purpose of DC generator brushes is to （）.<br>A:neutralize armature reaction<br>B:conduct electric current to an outside circuit<br>C:convert DC current to AC current<br>D:provide excitation to a DC generator

The purpose of DC generator brushes is to （）.
A:neutralize armature reaction
B:conduct electric current to an outside circuit
C:convert DC current to AC current
D:provide excitation to a DC generator

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