题目内容

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

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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

词汇与结构The pressure regulator unloads or ________ the engine driven pump when the desired pressure in the system is reached

A. relieves
B. believes
C. releases
D. grieves

词汇与结构In the event of a malfunction of the pressure regulator, the_______ (safety valve) will release any pressure above that maintained by the system pressure regulator.

A. check valve
B. relief valve
C. throttle valve
D. regulator