【单选题】
The voltage developed by an AC generator is controlled by varying the ()
A . speed of the prime mover
B . AC excitation to the field
C . DC excitation to the field
D . DC excitation of the voltage regulator
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根据网考网移动考试中心的统计,该试题:
3%的考友选择了A选项
6%的考友选择了B选项
86%的考友选择了C选项
5%的考友选择了D选项