A、 The drain float valves in the vent tubes and the vent channels dilute the fuel in the vent system to drain out of the tank when the fuel face is lower than the valve.
B、 The drain float valves in the vent tubes and the vent channels permit fuel in the vent system to drain into the tank when the fuel level is lower than the valve.
C、 The drain float valves in the vent tubes and from the vent channels allow the fuel in the vent system to drain into the tank when the fuel quantity is lower than the valve.
答案：B
A、 The drain float valves in the vent tubes and the vent channels dilute the fuel in the vent system to drain out of the tank when the fuel face is lower than the valve.
B、 The drain float valves in the vent tubes and the vent channels permit fuel in the vent system to drain into the tank when the fuel level is lower than the valve.
C、 The drain float valves in the vent tubes and from the vent channels allow the fuel in the vent system to drain into the tank when the fuel quantity is lower than the valve.
答案：B
A. Supply electrical power to both solenoids.
B. Apply hydraulic power to either of the solenoids.
C. Apply electrical power to one of the two solenoids.
A. 如果活门过早开启，停止测试。
B. 如果活门已经开启，停止测试。
C. 如果活门的开启时机未到，停止测试。
A. 燃烧室指发动机内燃油和空气混合并燃烧的部分。
B. 发动机混合室把燃油空气混合后点燃。
C. 发动机的做工段把燃油和空气混合并燃烧。
A. 将旋转开关设置为输入。
B. 将旋转开关设置为输出。
C. 将活动开关设置为输入。
A. 该计算机控制风扇气流以防止喘振。
B. 该计算机控制燃烧室气流以防止过热。
C. 该计算机控制压气机气流以防止失速。
A. 描述飞机起落架时，应说明应急展开系统。
B. 描述飞机起落架时，应描述起落架应急放出系统。
C. 描述飞机起落架时，应说明应急逃生系统。
A. 语音通信利用语音调制电磁波来从空对空或空对地的设备传输和/或接收消息。
B. 语音通信利用调频的电磁波来从空对空或空对地的设备传输和/或接收消息。
C. 语音通信利用调幅的电磁波来从空对空或空对地的设备传输和/或接收消息。
A. If you drink contaminated water , illness must happen.
B. You may be in trouble, if you drink bacteria free water.
C. If you drink water that contains bacteria, you will get sick.
A. 描述飞机的门、窗和出口时，应描述如何关闭飞行中意外打开的门或窗，以及如需在飞行中打开门或窗时，须遵守的任何限制。
B. 描述飞机舱门、窗和出口时，应阐述在飞行中意外掉落的门或窗如何关闭，以及对飞行中可能存在的故意打开的任何限制。
C. 描述飞机舱门、窗和出口时，应阐述在飞行中意外打开的门或窗如何关闭，以及对飞行中可能存在的无意打开的任何限制。
A. A maximum distance of 50 feet is required between consumable materials and the work area.
B. Keep flammable materials at a minimum distance of 50 feet from the work area.
C. Explosive materials must be kept at least 50 feet away from the work area.
