A、 Clean all lint, dust and debris from the ventilation holes located on the aft side of the captain＇s primary flight, navigation, and center lower engine display units.
B、 Clean the vent holes behind the captain＇s primary flight, navigation and lower middle engine display units which are blocked by lint, dust and debris.
C、 The captain＇s primary flight, navigation, and center lower engine display units must be cleaned since the ventilation holes behind them are clogged by lint, dust and debris.
答案：A
A、 Clean all lint, dust and debris from the ventilation holes located on the aft side of the captain＇s primary flight, navigation, and center lower engine display units.
B、 Clean the vent holes behind the captain＇s primary flight, navigation and lower middle engine display units which are blocked by lint, dust and debris.
C、 The captain＇s primary flight, navigation, and center lower engine display units must be cleaned since the ventilation holes behind them are clogged by lint, dust and debris.
答案：A
A. Make sure that there is supplied airflow in the work area.
B. Make sure that there is sufficient airflow in the work area.
C. Make sure that there is efficient airflow in the work area.
A. The operation procedure requires that the maintenance behavior be logically executable.
B. The logical maintenance steps or operating procedures constitute the maintenance procedures.
C. Break down maintenance activities into logical steps or operations as required by procedures.
A. Check the bypass valves.
B. Close the isolating valves.
C. Inspect the check valves.
A. 确保工作区域干净，无工具和其它物品，所有的接近盖板已经关闭。
B. 确保工作区域、工具和其它物品是干净整齐的，接近盖板已经关闭。
C. 确保工作区域、工具和其它物品是干净整齐的，接近盖板可以接近。
A. 这些测试检查设备和工具是用来维修适航性产品的。
B. 这些测试校验设备和工具是用来制造适航性产品的。
C. 这些测试检查设备和工具是用来确定产品适航性的。
A. The test will stop when the pressure is larger than 7000 kpa.
B. Stop the test if the pressure reaches 7000 pa.
C. Stop the test when the pressure is more than 7000 kpa.
A. When this material comes into contact with hot surfaces, it emits hazardous fumes.
B. Contact between hot surfaces and this material results in the release of harmful heat.
C. Dangerous fumes are consumed by this material upon contact with hot surfaces.
A. 最大起落架放下速度是指起落架放下状态下飞机可以安全飞行的最大速度。
B. 最大起落架收放速度是指起落架收放过程中飞机可以安全飞行的最大速度。
C. 最大起落架收上速度是飞机可以安全飞行的最大速度，起落架收上。
A. 位于连接发电机和驱动组件的法兰上的端口，使滑油在恒定转速驱动器和可用发电机之间流动。
B. 位于连接发电机和驱动组件的连接处的端口，使滑油产生了在变速驱动器和发电机之间流动的可能性。
C. 端口位于连接发电机和驱动组件的法兰上，使滑油可以在恒速驱动器和发电机之间流动。
A. 燃油排放系统保持油箱压力接近环境压力。太大的压力会引起机翼结构损坏。
B. 燃油通风系统保持油箱压力接近大气压力。压差过大会引起机翼结构损坏。
C. 燃油通风系统确保油箱压力在接近大气压时保持稳定。太大的压力变化会引起机翼结构损坏。
