A.voltage regulators
B.field rheostats
C.reverse power relays
D.prime mover governors
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A.120°apart
B.160°apart
C.180°apart
D.360°apart
A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
A.talk then released to listen
B.listen then released to talk
C.both talk and listen
D.ring the station being called
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
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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