855.当门开着时要小心。

A. 不允许通过扭转螺母将紧固件拉入孔内。

B. 在拧紧紧固件的时候要保持螺母不转动。

C. 拧紧紧固件与孔对齐,固定住螺母不要转动。

A. If a power supply system is independent to provide service to only one component or single- function system,it will be discussed together with the components or systems it serves.

B. When a power source services a singlecomponent,or serves a single functioning system,that power source will be included in the discussion of the component or system which it serves.

C. When a power supply is a complete component or single-function system,the device it serves is discussed separately from its own component or system.

A. 确保那些指示的位置是襟翼的位置。

B. 确保指示与襟翼的位置一致。

C. 确保那些迹象同意襟翼的位置

A. Maintenance should be accomplished preventively in accordance with the airplane service or maintenance manual.

B. Appropriate airplane service or maintenance manual shall be developed for the accomplishment of preventive maintenance.

C. Preventive maintenance should be accomplished in accordance with the appropriate airplane service or maintenance manual.

A. 在容易腐蚀的区域投入使用复合材料来阻止腐蚀过程。

B. 在受影响的区域投入使用防腐化合物来阻止腐蚀进程。

C. 在被影响的区域投入使用防腐化合物来彻底阻止腐蚀。

A. The charged resister acts as a primary battery.

B. The discharged resister acts as a secondary battery.

C. The charged capacitor behaves as a secondary battery.

A. 每条指令用一句话写出,除非有两个或更多的动作。

B. 每句话仅写一条指令,除非有两个或更多的动作同时发生。

C. 每条指令除非有两个或更多的动作同时发生,否则仅用一句话写出。

A. Isolate the section that is causing the trouble.

B. Separate the part that is causing the fault.

C. Identify the part that is causing the error.

A. Turn the cap counterclockwise.

B. Turn the cap clockwise.

C. Rotate the cap clockwise.

A. The correction installation of the upper drag strut can prevent the retraction of the lower drag strut.

B. If the upper drag strut is installed improperly,the lower one will be hit during retraction.

C. The removal of the upper drag strut has to be done properly so that the lower one can fully extend.