A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.<br>A:Frequency meter<br>B:Ammeter<br>C:Voltmeter<br>D:All of the above

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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