Clean the surface with a soap-and-water solution.

A. Do not refuel the aircraft during maintenance.

B. Do not defuel the aircraft in the period of maintenance.

C. Stop refueling the aircraft before maintenance.

A. Check all parts with clear defects in accordance with standard industry practices.

B. Check all parts for visible defects in accordance with standard industry practices.

C. Check all parts for serious defects in accordance with standard industry practices.

A. All the related data shall be grouped in a logical manner.

B. A logical method is required to group the unconcerned data together.

C. Divide all the involved data into groups logically.

A. 安装前先润滑密封件。

B. 安装前先把润滑油进行密封。

C. 在设备前面密封润滑油。

A. 确保流经管路的液体没有气泡。

B. 确保管路渗漏出的油液没有气泡。

C. 确保液压油通过管路，且没有产生气泡。

A. 用来记录与具体系统没有关系的数据的单位和组件。包括组件：飞行记录仪、表现或保持记录仪等。

B. 用来记录数据的单位和组件，与某些特定系统毫无关系。包括的组件有：空速记录仪、性能或维护记录仪。

C. 这些部件和组件用于记录并不关联于特定系统的数据，包括飞行记录仪、性能或维修记录仪等部件。

A. 对2号引擎进行排故。

B. 对2号发动机进行大修。

C. 对2号发动机进行校验。

A. The operation rods are connected to the hydraulic feedback.

B. The operation barrels are connected to the hydraulic return.

C. The actuators are connected to the hydraulic return.

A. Due to the incorrect level of pressure, the system will not work.

B. As long as the fluid level remains unstable, the system will fail.

C. Because the fluid level is incorrect, the system will not operate.

A. 为了便于旅客和机组人员在紧急情况下快速撤离,所有主要旅客门也可以作为紧急出口.

B. 为了机组人员在紧急情况下从快速通道撤离,所有这些主要的门都应作为紧急撤离出口.

C. 为了便于有紧急事务的旅客快速离开，所有主要旅客门都可以作为紧急出口.