In the description of the airplane＇s Doors, Windows and Exits, how to close a door or window if it opens accidentally in flight and any restrictions there may be on purposely opening in flight shall be discussed.

A. If you do not secure the rigging pin, the elevators will descend when there is pressure in the system.

B. If you do not install the rigging pin, the elevators will move down when there is no pressure in the system.

C. Without the rigging pin installed, the elevators will not lower when there is no pressure in the system.

A. 图2是受损织物的修复过程示例。

B. 图2举出了两个受损网络的修复过程。

C. 图2是损坏网页的修复程序示例。

A. When simulating altitude, make sure you have alternate ATC transponders in active mode.

B. Make sure that the ATC transponders are in standby mode when you simulate altitude.

C. It is optional to keep the ATC transponders in ready mode during altitude simulation.

A. 在工作区入口处设置安全屏障。

B. 在工作区域放置安全电源。

C. 放置安全屏障在入口通道的位置。

A. Make sure that the flaps are retracted and the aileron trim handwheel is in the zero position.

B. Ensure that the flaps are partially extended and the aileron trim handwheel is centered at zero.

C. Make sure that the flaps are raised and the aileron trim handwheel is set to non-zero position.

A. 飞行员操作手册的本节应包含重要的补充材料（操作信息），以便安全有效地操作配备了各种选装系统和设备的标准飞机。

B. 为了安全顺畅地操作飞机，当标准飞机未配备选装系统和设备时，飞行员操作手册的本节应包含必要的补充材料（操作信息）。

C. 飞行员操作手册的本节应包含适当的补充材料（操作信息），以便在配备了标准飞机所没有的各种选装系统和设备情况下，安全有效地操作飞机。

A. If you find a crack, do the applicable repair procedure.

B. If you find a crash, do the applicable maintenance procedure.

C. If you find the wear, do the applicable repair procedure.

A. 用真空清洁器和刷子清洁设备的内部及其底座。

B. 用真空清洁器和刷子清洁设备的外表面以及安装架。

C. 真空清洁设备及硬件设施的表面涂层。

A. Other information or messages, e.g."Report to the manufacturer about the cracks existed", is included here.

B. Additional information or instructions,such as "Report any cracks found to this manufacturer”, are contained here.

C. You can find the following instructions here, for example " Report any scratches to the OEM".

A. Thus, the more words there are in a cluster, the more difficult it is to understand.

B. Therefore, the more words are there in a phrase, the more difficult it is to understand.

C. So, the more nouns in a phrase, the harder it is to understand.