单选题Most hydraulic steering gears are fitted with relief valves which（）Afunction when the rudder is amidshipsBrelieve excess whip pressure from the hydraulic oil systemCprotect the piping assembly from external rudder shockDrelieve excessive telemotor pressure
单选题
Most hydraulic steering gears are fitted with relief valves which（）
A
function when the rudder is amidships
B
relieve excess whip pressure from the hydraulic oil system
C
protect the piping assembly from external rudder shock
D
relieve excessive telemotor pressure
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相关考题：
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