3139. If you do not do a regular monitoring of the APU oil consumption, do the steps that follow to make sure that the APU oil quantity is sufficient for the flight

A. If the unit is unchanged, it is necessary to monitor the ambient temperature for at least 15 cycles.

B. Keep monitoring the temperature of the unit for a minimum of 15 cycles until you install a new one.

C. If the unit remains unchanged, its temperature should be checked for at least 15 cycles.

A. Obey the safety precautions when you do work with high voltages.

B. When working with high resistances, you should follow the safety precautions.

C. The safety precautions are optional in an environment with high voltages.

A. The temperature increase results in the tension decreasing in the cables.

B. The temperature increase affect slightly the tension in the cables.

C. The tension in the cables is a crucial factor in the temperature changes.

A. The presence of water in fuel is dangerous.

B. The incidence of water in fuel is dangerous.

C. Water in the fuel is dangerous.

A. 空气通过发动机的导流叶片、支撑罩、外壳等部件进入压气机。

B. 空气通过发动机进入压气机的部分。包括导流叶片、支撑罩、外壳等。

C. 空气通过导流叶片、支撑罩、外壳等部件进入压气机。

A. INCLUDE

B. INCLUDES

C. INCLUDING

A. 泵的控制开关上有一个防护装置,可以防止意外操作。

B. 泵的控制开关上有一个盖,可以防止意外操作。

C. 泵的控制电门上有一个盖,可以保护意外操作。

A. 在管道接头周围缠绕两层胶带。

B. 在管子周围缠绕两层胶带。

C. 在管道接头周围涂抹两层胶水。

A. If there is hum from the loudspeaker,don＇t adjust the potentiometer.

B. Adjust the potentiometer unless hear a hun from the loudspeaker.

C. Adjust the potentiometer until the loudspeaker no longer hums.

A. Without this modification, the service life of the unit can be uncertain.

B. Without this modification, it is possible that the service life of this unit will be shorter than ever

C. Without this modification, it is possible that the service life of this unit will be shorter than usual