Supplementary Air is that portion of the system which varies and controls supplementary air flow to the exhaust system.

A. The STE sentence uses approved words to give the same information clearly in a different way.

B. The STE sentences use the approved different words to vaguely show the same information.

C. STE sentences use different words in approved means to obviously express the same information.

A. 戴上氧气面罩并进行呼吸，确认其供氧正常。

B. 在佩戴氧气面罩前进行深呼吸，确认血液中氧气充足。

C. 为确保供氧正常，请不要摘下氧气面罩并进行呼吸。

A. 描述飞机加热、通风、除霜和空调系统时，应说明如何使用所提供的操纵系统获得最大效益。

B. 描述飞机加热、通风、除霜和空调系统时，应说明如何使用所提供的控制装置使这些系统能够获得最大效益。

C. 描述飞机加热、通风、除霜和空调系统时，应说明如何获得最大收益以便使用所提供的控制装置。

A. Some aircraft parts are combined materials.

B. Some airplane structures are composite materials.

C. Some aircraft structures are compound materials.

A. “非计划性勤务”包括对于停放的飞机进行除冰除雪、在过长时间的停车后对星型发动机进行预先润滑等方面的说明。

B. “非计划性勤务”包括对于停放的飞机进行除冰除雪、在长时间停车后对活塞发动机进行预先润滑等方面的说明。

C. “非计划性勤务”包括对于停放的飞机进行除冰除雪、在过长时间的停车后对活塞发动机进行润滑等方面的说明。

A. The power plant uses an air vent or propeller to produce power.

B. The power plant develops thrust either through the exhaust or through a propeller.

C. The power plant generates propulsion with the aid of the exhaust or a propeller.

A. 这将使用户可以通过检查一份清单来识别受影响的飞机，而不必检查每个单独的持续适航计划以确定适用性。

B. 这将允许用户通过检查一份清单来找出受影响的飞机，或者也可以检查每一个持续适航计划的适用性。

C. 这将使用户可以通过检查一份清单来判断被影响飞机的有效性，而无需检查每个独特的持续适航计划。

A. 406MHz数字信号可识别应急定位发射器及其位置。

B. 406MHz数字信号可标记应急定位发射器并发送其位置。

C. 406MHz数学信号可由应急定位发射器来识别并发送其位置。

A. They comprise the three parts as follows:tail assembly,the structures at the rear of the airplane ,structures forming part of and attached to the wing.

B. They include three parts,one of them is tail assembly,one of them is the structures part at the rear of the airplane,one of them is structures part that forming part of and attached to the wing.

C. They include two parts,one of them is tail assembly at the rear of the airplane that serve to control and maneuver the aircraft,another of them is structures part that forming part of and attached to the wing.

A. 这些ALIs 是强制性的，未经负责飞机型号证书的FAA 办公室或适用的监管机构的批准，不能更改或删除。

B. 这些ALIs 是指令性的，未经FAA办公室批准不得更改或删除。FAA办公室负责飞机型号证书，或发布适用的管理规章。

C. 这些ALIs 是非常必要的，任何更改或删除必须获得FAA办公室批准，或者其他可以颁发飞机型号证书的监管机构的批准。