The main cause of valve failure is contamination of hydraulic fluid.

A. 用于在飞机外部提供照明的照明子系统。包括着陆灯、导航灯、位置指示灯、机翼照明灯、旋转灯、航行灯。

B. 用于在飞机外部提供照明的照明子系统。包括着陆灯、位置指示灯、航行灯、机翼照明灯、旋转式信号灯、出租车灯。

C. 用于为飞机外部提供照明的灯光子系统，包括着陆灯、导航灯、位置指示灯、机翼照明灯、旋转式信号灯、滑行灯等。

A. When describing the airplane＇s Engine, spark plug system shall be described.

B. When describing the airplane＇s Engine, starter system shall be described.

C. In the description of the airplane＇s Engine, ignition system shall be described.

A. 随之，会导致电子和电气设备和系统的永久失效或超温。

B. 因此，会导致电子和电气设备和系统的临时或永久失效。

C. 此后，会导致电子和电气设备的临时或永久功能衰退。

A. A brush is cleaned by the filter element.

B. The filter element and a brush are clean.

C. Use a brush to clean the filter element.

A. Airline performance data shall be presented in either graphical or tabular formats.

B. Airplane performance data shall be presented in either graphical or tabular formats.

C. Airplane restriction data shall be presented in either graphical or tabular shapes.

A. 发动机支架用于支撑发动机，固定机舱或塔架上的框架，要么是组装式结构，要么是锻造件。

B. 发动机支架要么是积木式结构，要么是锻造件，用来支撑发动机并将其固定在机舱或塔架上。

C. 发动机支架指支撑发动机并将其固定在短舱或吊架上的框架，要么是装配结构，要么是锻造件。

A. 如果不遵守特殊预防措施，机械员打开舱门时很容易造成站在门附近的人员受伤。

B. 打开车门的机械员没有遵守规舱定的安全预防措施，造成了站在附近的人员受伤。

C. 机械员在未遵守规定的安全预防措施的情况下打开舱门，很容易造成站在舱门附近的人员受伤。

A. In order to locate lower margins of safety components and areas, current records were reviewed.

B. To find components and areas where have showed lower margins of safety, existing results were examined.

C. Existing analyses were reviewed to identify components and areas that may have exhibited lower margins of safety.

A. The condition of the radome is very important for its performance.

B. The condition of the antenna influences its properties greatly.

C. The condition of the radar has an important effect on its characteristics.

A. 所有发动机工作的推荐爬升速度

B. 全发工作的最低爬升速度

C. 建议的最大爬升速度