单项选择题
In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.
A.trick-wheel
B.follow-up control
C.six-way valve
D.Rapson slide
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相关考题
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单项选择题
The internal force of a material, which tends to resist deformation when subjected to external forces, is known as （）.
A.stress
B.strain
C.shear strength
D.ultimate tensile strength -
单项选择题
An increase in rotor clearances in a rotary pump will （）.
A.increase discharge pressure
B.decrease pump capacity
C.decrease pump cavitation
D.decrease reaction ring clearance -
单项选择题
Sweating of the refrigeration system compressor crankcase is caused by （）.
A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor
