单选题A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.AFrequency meterBAmmeterCVoltmeterDAll of the above
单选题
A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.
A
Frequency meter
B
Ammeter
C
Voltmeter
D
All of the above
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