One factor that determines the frequency of an alternator is the（）.<br>A:number of turns of wire in the armature coil<br>B:number of magnetic poles<br>C:strength of the magnets used<br>D:output voltage

One factor that determines the frequency of an alternator is the（）.
A:number of turns of wire in the armature coil
B:number of magnetic poles
C:strength of the magnets used
D:output voltage

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