Which of the devices listed when used on an electro-hydraulic steering gear keeps the mo

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Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?

A.The follow-up gear

B.The rudder angle indicator

C.The synchronous electric transmitter

D.A rudder angle limit switch

请帮忙给出正确答案和分析,谢谢!

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