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

A、lobe type

B、screw type

C、axial piston type

D、volute type

The （） returns the pump operating rod to mid position as soon as the helmsman stops turning the wheel.

A、hunting gear

B、cut-off level

C、servo-motor

D、swivel block

A leaking diesel engine fuel injector will cause（）

A、prolonged maintenance intervals

B、improved atomization

C、greater fuel economy

D、incomplete combustion

While loading bulk oil, you notice oil on the water near the bargeWhich of the following actions should you carry out FIRST?（）

A、Search the vessel for leaks

B、Notify terminal superintendent

C、Stop loading

D、Notify the Coast Guard

The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）

A、opposing operational drag

B、pressure distribution

C、differential

D、system purge

The accident resulted （） the motorman’s carelessness.

A、in

B、to

C、from

D、by