512、lf the drain hole is clogged(堵塞), clean it.

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.

A. 　 Put down a face mask and protective clothing.

B. 　 Put on a face goggle and protective clothing.

C. 　 Put on a face mask and protective clothing.

A. 　 This section tells how to identify a fault by checking flight instruments.

B. 　 This section tells parameters on flight instruments.

C. 　 This section tells how to find a failure of flight instruments.

A. 　保护漆将防止腐蚀达 6 个月。

B. 　保护涂层将防止锈蚀达 6 个月。

C. 　保护漆将保护腐蚀达 6 个月。

A. 　制定本规范的目的是为了降低成本

B. 　本规范是为了减少失误而制定的

C. 　规范的制定是为了发展航空安全

A. 　用于指示低压的压力计使用更灵活的管子,更容易展开和卷绕。

B. 　用于指示较低压力的仪表使用更易弯曲的管子,线圈更易散开和缠绕。

C. 　用于指示较低压力的压力表使用的软管更加柔软,可以随时解开和盘绕。

A. 　测量跑道灯连接的电阻。

B. 　校准跑道灯连接的电阻。

C. 　复核跑道灯连接的电阻。

A. 　 Print all pages besides wiring diagrams and foldouts on both sides.

B. 　 Print all pages other than wiring diagrams and foldouts on both sides.

C. 　 Print all pages no more than wiring diagrams and foldouts on both sides.

A. 　径向施加载荷

A. 　检查厕所快速增压装置。

B. 　检查厕所快速减压装置。

C. 　检查厕所定期减压装置。