A switchboard for an AC electrical system requires the use of which of the following devices（）.<br>A:Frequency meter<br>B:Ohmmeter<br>C:Induction voltage regulator<br>D:Current transformer governor

A switchboard for an AC electrical system requires the use of which of the following devices（）.
A:Frequency meter
B:Ohmmeter
C:Induction voltage regulator
D:Current transformer governor

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