573.What is the purpose of the safety valves?

　To avoid negative differential pressure

　To replace the out outflow valves

　To prevent excessive positive and negative differential pressure

正确答案：C

A320机型英语知识练习

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88.Which device blocks the outer control handle during inner control handle operation ?

87.How is the operator warned, when there is a residual pressure in the cabin?

86.The passenger door is maintained parallel to the fuselage by :

85.When is the drain tank emptied ?

84.On ground, in case of failure, how can you open or close the air intake flap ?

83.Normal APU shutdown is performed from ?

82.From where can an APU emergency shut down be performed ?

81.What is the main function of the APU ?

80.The starter motor assists the APU up to which speed ?

79.APU is running and APU bleed air system is in use. What happens if APU MASTER SW pushbutton is released out ?