单选题In an alternating current electrical system, a low system power factor is a direct sign of （）Awasted energyBefficient operationCa short in the exciter field windingsDan excessive number of minor system grounds
单选题
In an alternating current electrical system, a low system power factor is a direct sign of （）
A
wasted energy
B
efficient operation
C
a short in the exciter field windings
D
an excessive number of minor system grounds
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