The DC excitation to the field of brushless synchronous is generally produced by （）<br>A:an exciter driven by the same shaft with the generator<br>B:an exciter driven by external prime mover<br>C:generator itself<br>D:either A and B

The DC excitation to the field of brushless synchronous is generally produced by （）
A:an exciter driven by the same shaft with the generator
B:an exciter driven by external prime mover
C:generator itself
D:either A and B

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