【单项选择题】
An AC synchronous transmission type remote steering control system consists of a （）.
A、A.transmitter at the steering station and a receiver at the steering engine
B、B.reversible motor at the steering station geared to the steering pumps
C、C.small induction motor on the bridge which controls the redder through pulleys
D、D.variable displacement hydraulic pump driven by a reversible DC motor
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