2123. De-icing is a procedure that removes ice and snow from the aircraft surfaces

A. 用章节号和连字符(比如“1-”表示“物理要求”章节中的所有页面)加节号对持续适航方案里的多章节页面进行编号,节号从“1”开始(如第1-1,1-2页等)。

B. 用节号和破折号(比如“1-”表示“物理要求”章节中的所有页面)加章号对持续适航方案里的多章节页面进行编号,节号从“1”开始(如第1-1,1-2页等)。

C. 用章号和破折号(比如“1-”表示“物理要求”章节中的所有有额面)加节号对持续适航方案里的多章节页面进行编号,节号从“1”开始(如第1-1,1-2页等)

A. When the input of the NOT gate is logic one, the output should be logic one.

B. The output keeps constant as one no matter which logic the input is.

C. When the input of the NOT gate is logic one, the output should be logic zero.

A. The closed door prevents airflow from entering the compartment and may cause death because of no air to breathe.

B. When the access plate is closed, the lack of ventilation of the compartment brings a risk of suffering injury.

C. If you close the opening, the airflow can not enter into the compartment and creates a risk of jam.

A. Make sure that the coils of the oxygen hose do not rub together.

B. It is acceptable the coils of the chlorine hose rub together.

C. Ensure that the coils of the nitrogen hose do not rub together.

A. Mechanical devices that drive the engine at a desired RPM.

B. Mechanical devices that drive the generators at a desired RPM.

C. Electromechanical devices that drive the generators at a desired RPM.

A. If the engine appears to be heating, turn it off.

B. If the engine appears to be overheating, turn it off.

C. If you think the engine is too hot, turn the switch to off"＇"

A. If you do not safety the door, strong winds must cause damage to the structure.

B. If you do not safety the door, damage to the structure due to strong winds is acceptable.

C. If you do not safety the door, damage to the structure due to strong winds is probable.

A. 将O形环安装在锥形轴承的内部凹槽中

B. 将O形环安装在圆柱形轴承的内部凹槽中

C. 将O环安装在球形轴承的内部凹槽中

A. 在某种情况下,戴护目镜

B. 在某种情况下,戴防护服

C. 在某种情况下,戴呼吸设备

A. when the inspector asks, please show your license and obligations.

B. Please show your license and qualification authorization when asked by the inspector.

C. Please show your license and quality duties when asked by the inspector.