4. 绿灯亮时,系统准备工作。

A. Elevator is a hinged moveable part on the trailing edge of the lateral stabilizer

B. Elevator is a hinged moveable part on the trailing edge of the vertical stabilizer

C. Elevator is a hinged moveable part on the trailing edge of the horizontal stabilizer

A. 火灾是因为过热或者有火焰的液体泄漏,并且可能飞机不安全了。

B. 火灾可由过热或易燃液体泄漏引起,并且可能飞机就危险了。

C. 火灾可由过热或易燃流体泄漏引起,并可能危及飞机安全。

A. The values doesn＇t have to be more than the approved differences.

B. The values must be less than the approved differences.

C. The values must not be less than the approved differences.

A. Detection system will provide information about how to detect ice.

B. Detection system is utilized to find and display the information of ice

C. The detection information of ice from the indication system.

A. A advisement of information in a ready-made manual can be taken as a revision.

B. A revision refers to an adjustment of information in a manual under publishing.

C. A modification of information in an existing manual can be called a revision.

A. 将孔铰成比标准尺寸大 0.20 英寸。

B. 将孔铰成比标准尺寸大 0.20 英尺。

C. 将孔定位成比标准尺寸大 0.20 英寸。

A. 出现在基本维修手册中的系统/章节/部分中的线路图同时也在单独的线路图手册中出现。

B. 线路图可能出现在基本维修手册中的系统/章节/部分中或者在单独的线路图手册中出现。

C. 线路图出现在基本维修手册中的系统/章节/部分中和单独的线路图手册中出现。

A. Landing gear is left for ten minutes.

B. Landing gear should be kept extended for ten minutes

C. Extend landing gear after ten minutes retraction.

A. Not only the basic principle of the reciprocating engine is simple, and also the assembly.

B. The basic principle of a jet engine is simple, and so is its construction.

C. The basic principle of the propeller driven engine is simple, as well as the installation.

A. 为防止损坏发动机,立即打开所有安装的防护罩。

B. 为防止损坏发动机,稍候装上所有开口的防护罩。

C. 为防止损坏发动机,立即在所有开口上安装防护罩。