单项选择题
A.a differential gear
B.return springs
C.a hydraulic accumulator
D.relief valves
单项选择题 Most hydraulic steering gears are fitted with relief valves which（）
单项选择题 On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?（）
单项选择题 Rudder motion is prevented from exceeding the movement of the steering wheel by the（）