单项选择题
A.relieves excessive fluid pressure
B.takes the pump off stroke when the desired rudder angle is attained
C.synchronizes wheel position with the rudder position
D.returns the rudder to midposition when the wheel is released
单项选择题 When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）
单项选择题 In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in（）
单项选择题 As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is（）