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单选题
The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）
A
full excitation
B
load
C
power factor
D
number of poles
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考题
单选题The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）A
full excitationB
loadC
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number of poles
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Commutator and brushesC
Rotor and interpolesD
Field and exciter
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填空题Nikola Tesla invented alternating current technology that enabled electricity to be transmitted over long distances.____
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