初始表面涂饰和新表面涂饰之间不应有视觉差异。

A. 饮用水系统是系统中用于储存新鲜饮用水和洗涤用水的那部分。

B. 饮用水系统是系统中用于储存和输送新鲜饮用水的那部分。

C. 饮用水系统是系统中用于输送新鲜饮用水和废水的那部分。

A. 货舱里有地板和衬层。衬层防止货舱内出现烟雾，防止对衬层和导线造成损坏。

B. 货舱里有地板和衬层。衬层使烟雾留在货舱，防止对衬层和导线造成损坏。

C. 货舱里有地板和衬层。衬层使烟雾留在货舱，防止对管路和导线造成损坏。

A. As the depressurization of the alternate system, the hydraulic system A must be released to open the rudder hydraulic system selector valve and permit hydraulic fluid to flow to the rudder actuator below.

B. In order to depressurize standby system, the hydraulic system A must be depressurized to open the rudder hydraulic system selector valve and let hydraulic fluid flow to the lower rudder actuator.

C. Due to the depressurization of the alternate system, the hydraulic system A must be released to open the rudder hydraulic system selector valve and permit hydraulic fluid to flow to the bottom rudder actuator.

A. Make sure that the bolts are tight.

B. Make sure that the screws are securely installed.

C. Make sure that the bolts are loose.

A. Handbooks shall be ready to revise in accordance with the specification.

B. In accordance with the specification, manuals should be easy to revise.

C. Handbooks have been already revised, according to the specification.

A. Every maintenance item has to obey a procedure.

B. Follow the procedure to do the repair.

C. For every repair, there is a procedure for us to follow.

A. 用干净的棉布浸湿水后清除除污剂。

B. 用清水浸湿并清洗带有洗涤剂的干净棉布。

C. 用干净的棉布清除污渍，再用清水洗涤。

A. Turn the cap counterclockwise.

B. Turn the cap clockwise.

C. Rotate the cap clockwise.

A. 两个半圆形的挡板控制空气流。

B. 两个半导体的金属圈控制空气流。

C. 两个半圆形的金属圈控制空气流。

A. 在此推荐清单中，更换部件对于起落架收放系统和其相关的指示系统来讲是不合理的。

B. 在此推荐清单中，起落架收放系统和适用的指示系统没有可更换的部件。

C. 此推荐清单不能用于起落架放下系统部件更换但适用于指示系统。