单选题Aboard ship, a grounded field coil in an AC motor can be determined by using a （）.Aportable growlerBgalvanometerCvisual inspectionDmegohmmeter
单选题
Aboard ship, a grounded field coil in an AC motor can be determined by using a （）.
A
portable growler
B
galvanometer
C
visual inspection
D
megohmmeter
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