题目内容

词汇与结构A ________ is a screening or straining device used to clean the hydraulic fluid.

A. filter
B. filler
C. flier
D. fighter

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词汇与结构A hand pump is the simplest pump which is operated ________ for emergency use in some light airplane.

A. manually
B. automatically
C. differently
D. completely

词汇与结构If such material is not removed, it may cause the entire hydraulic system of the aircraft to fail through the breakdown or ________ of a single unit of the system.

A. functioning
B. function
C. malfunctioning
D. malfunctioned

词汇与结构When one of the actuating units has been operated and pressure in the line between the pump and selector valve builds up to the desired value, a ________ in the pressure regulator automatically opens.

A. valve
B. valid
C. variety
D. value

词汇与结构In the event of a malfunction of the pressure ________ , the relief valve (safety valve) will release any pressure.

A. regulation
B. regulate
C. regulator
D. regular