单选题（）conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system unit the desired angle is reached.AThe control equipmentBThe power unitCThe transmission systemDThe follow-up mechanism
单选题
（）conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system unit the desired angle is reached.
A
The control equipment
B
The power unit
C
The transmission system
D
The follow-up mechanism
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