单项选择题

（）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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船舶电气与船舶安全

（）conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system unit the desired angle is reached.