A.talk then released to listen
B.listen then released to talk
C.both talk and listen
D.ring the station being called
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A.The total current flow equals the sum of the individual currents
B.The total current flow equals the reciprocal of the sum of the individual currents
C.The total resistance equals the sum of the individual resistance
D.The total voltage equals the sum of the individual voltages across each resistance
A.Low voltage protection circuit
B.Non-renewable link fuse
C.Renewable link fuse
D.Low voltage release circuit
A.The voltage drop across each resistor is the same
B.The total current flow equals the reciprocal of the sum of the individual currents
C.The total resistance equals the sum of the individual resistances
D.The total voltage equals the sum of the individual voltages across each resistance
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
A.small wire brush
B.compressed air jet
C.clean dry cloth
D.10% solution carbon solvent and water
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Flame failure in an automatically fired auxiliary boiler can from a/an （）