Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?（）<br>A:Peak value<br>B:Root-mean-square value<br>C:Average value<br>D:Maximum value

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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