The purpose of the commutator and brushes on a DC generator is to（）<br>A:change AC to DCcurrent<br>B:change DC to AC current<br>C:neutralize a armature reaction<br>D:carry current to the outside circuit

The purpose of the commutator and brushes on a DC generator is to（）
A:change AC to DCcurrent
B:change DC to AC current
C:neutralize a armature reaction
D:carry current to the outside circuit

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