单项选择题
The hydraulic oil most likely to thin out when hot and thick when cold would have a viscosity index of（）
A.20
B.40
C.60
D.80
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相关考题
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单项选择题
When the steering wheel is turned, oil is directed to the steering gear rams by（）
A.modulating the oil flow with the six-way valve
B.moving the automatic pressure differential valve
C.moving the receiving telemotor which regulates the tow-way valve
D.varying the eccentricity of a floating ting or angle of a tilting box -
单项选择题
Rudder position is shown on the bridge by the（）
A.rudder angle indicator
B.follow-up gear
C.telemotor position
D.relief valves -
单项选择题
In an elector-hydraulic steering system, rudder shock is limited by（）
A.a differential gear
B.return springs
C.a hydraulic accumulator
D.relief valves
