If you see discoloration, replace the part.

A. 结构类别分为三类：主要的、次要的、备用的。

B. 结构类别分为三类：主要的、次要的、必需的。

C. 结构类别分为三类：主要的、次要的、第三位的。

A. Separate the first part of the sentence as the subsequent items in the lateral list.

B. Apart the first part of the sentence from the subsequent items in the horizontal list.

C. Divide the first part of the sentence from the subsequent items in the vertical list.

A. Those units and components provide for external and internal illumination such as landing lights, taxi lights, position lights, rotating lights, ice lights, cabin warning lights, passenger reading and cabin dome lights, etc.

B. Those units and components provide for external and internal illumination such as landing lights, taxi lights, position lights, rotating lights, ice lights, master warning lights, passenger reading and cabin dome lights, etc.

C. Those units and components provide for external and internal illumination such as landing lights, taxi lights, navigation, position indicating, ice lights, master warning lights, passenger reading and cabin floor lights, etc.

A. The distribution system is used to store and distribute air pressure.

B. Distribution system is used to induct and distribute air.

C. Air inlet system is used to distribute air to all systems.

A. 如果情况发生变化，则使用不同的材料。

B. 如果情况发生改变，则使用不同的建筑物。

C. 如果意思有变化，则使用不同的结构。

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. The pump is installed behind the hydraulic motor.

B. The gearbox is installed behind the pneumatic motor.

C. The hydraulic motor is installed behind the pump.

A. 检查所有的部件和液力管路连接。

B. 检查所有的部件, 液力接头和连接管路。

C. 连接全部零件和液力管路。

A. Oil comes from the supply system to lubricate and cool internal components in the engine.

B. Oil coming from the scavenge system will supply lubrication and cooling for the internal components of the engine.

C. The oil supply system will give lubrication and cooling for the internal components of the engine.

A. 在提供给客户的所有技术资料中，规则应保持一致。

B. 在提供给客户的所有技术数据中，文化词汇应保持一致。

C. 在提供给客户的所有技术资料中，术语应保持一致。