The engine bleed air system leak check using the APU describes how to use the APU to pressurize the system to check the sense lines and these system components for leaks.
发动机引气系统检漏用APU介绍了如何使用APU对系统加压，检查检测管路和这些系统部件是否有泄漏。
A.In order to do the engine bleed system leak check use APU to pressurize the system and check if there are leaks in the sensing tube and these system components. B.The leak inspection of the engine bleed air system describes how to use APU to pressurize the system to inspect whether the sense lines and the system parts leak or not. C.The way to check the leakage of the senses pipes and the system components by compressing system using APU is described.正确答案B
