题目内容

The pressure regulator unloads or ______ the engine driven pump when the desired pressure in the system is reached.

A. believes
B. relieves
C. retrieves
D. receives

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A ______ is a screening or straining device used to clean the hydraulic fluid, thus preventing foreign particles and contaminating substancesfrom remaining in the system.

A. pump
B. reservoir
C. regulator
D. filter

词汇与结构Hydraulic power is one of the power sources which are widely used in modern airplanes to operate various airplane units and_____

A. mechanisms
B. machines
C. techniques
D. organs

词汇与结构Among the units commonly ________ by hydraulic systems are landing gear, wing flaps, slats, speed and wheel brakes, nose wheel steering and primary flight control surfaces.

A. applied
B. updated
C. cooperated
D. operated

词汇与结构The hydraulic reservoir is a tank or a ________ designed to store sufficient hydraulic fluid for all conditions of operation.

A. maintainer
B. retainer
C. container
D. obtainer