A.cannot be detected tinder normal conditions
B.is of no consequence to engineering personnel
C.is indicated at the branch circuit breaker panel
D.is indicated by the ground detecting lamps on the main switchboard
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A.small wire brush
B.compressed air jet
C.clean dry cloth
D.10% solution carbon solvent and water
A.portable growler
B.galvanometer
C.visual inspection
D.megohmmeter
A.over-speed trip
B.reverse power relay
C.back pressure trip
D.governor controls
A.Impedance
B.Current
C.Resistance
D.Voltage
A.Frequency meter
B.Ammeter
C.Voltmeter
D.All of the above
最新試題
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Which of the following items don’t belong to dock repair works?（）