单选题A switchboard for an AC electrical system requires the use of which of the following devices（）.AFrequency meterBOhmmeterCInduction voltage regulatorDCurrent transformer governor
单选题
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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