单项选择题

Hydraulic pumps most commonly used in steering systems are of the （）.

A.lobe type
B.screw type
C.axial piston type
D.volute type

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单项选择题

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply

单项选择题

A.keyway
B.shaft
C.packing
D.valve

单项选择题

A.turbine
B.centrifugal
C.ejector
D.mixed flow