题目内容

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

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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

词汇与结构Hydraulic pressure must be ________ in order to use it to perform the desired tasks.

A. regulated
B. administrated
C. governed
D. regulation

词汇与结构The filter can prevent ________ particles and contaminating substances from remaining in the system.

A. domestic
B. foreign
C. strange
D. outside