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搜题
【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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皮皮学刷刷变学霸
举一反三
【单选题】SpeakerA: How often do you exercise, Tom? SpeakerB:
A.
Twice a week.
B.
Two days.
C.
The second day.
【简答题】冰淇淋按照其软硬程度,可分为硬质冰淇淋和 ,它们二者的区别是硬质冰淇淋在凝冻后装入容器,并经过 处理。