打开单向活门。

A. 需要对车辆以及随车配置的牵引杆和牵引钢索进行牵引。

B. 需要牵引车、牵引杆、牵引钢索等。

C. 需要牵引车、牵引杆、牵引线束等牵引设备。

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. 重心是飞机悬浮时保持平衡的点。它与参考基准的距离是通过总力矩除以飞机的总重量得出的。

B. 飞机的重心是使飞机保持平衡的点。它与参考基准的距离可以通过总弯矩除以飞机总重量找到。

C. 重心是如果飞机悬着使飞机保持平衡的点。它到参照基准的距离可以通过总长度除以总重量找到。

A. 如果结果不同，请执行此测试。

B. 如果数值不同，请执行此测试。

C. 如果数值相同，请执行此测试。

A. 使用容器混合材料。

B. 使用棍子搅拌材料。

C. 使用铲子混合材料。

A. Slowly and fully extend the RAT and make sure that it does not touch other parts.

B. Quickly and fully retract the RAT and make sure that it does not touch other parts.

C. Slowly and carefully extend the RAT and make sure that it does not attach to other parts.

A. Turn the adjuster clockwise to make the display brighter.

B. Turn the adjuster clockwise to make the display dimmer.

C. Adjust the brightness of the display by turning the adjuster.

A. The EEC processes the simulated signal from the fuel filter differential pressure bulb.

B. The fuel filter differential pressure sensor sends an modulated signal to the EEC.

C. The EEC receives the analog signal from the fuel filter differential pressure switch.

A. Documents must be temporarily edible.

B. Documents must be readily revisable.

C. Documents must be permanently durable.

A. The air conditioning cooling system supplies cooled air to the cabin. Includes items such as the cooling unit, indicating systems related to the cooler operation, etc.

B. The air conditioning cooling system supplies cold air to the passenger cabin. Includes items such as the cooling unit, indicating systems related to the cooler operation, etc.

C. The air conditioning cooling system supplies cooled air to the passenger cabin. Includes items such as the cooling pack, indicating systems related to the cooler operation, etc.