单选题Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?（）APeak valueBRoot-mean-square valueCAverage valueDMaximum value
单选题
Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?（）
A
Peak value
B
Root-mean-square value
C
Average value
D
Maximum value
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