单选题The frequency of an alternator at a given RPM is determined by the （）.Anumber of turns of wire in the armature coilBnumber of magnetic polesCstrength of the magnets usedDoutput voltage
单选题
The frequency of an alternator at a given RPM is determined by 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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