Do not use crocus cloth on aluminum parts,Crocus cloth contains ferrous oxide and can cause corrosion on aluminum parts.

A. 液压系统包括将一定压力（包括泵、压力调节器、管路、阀门）的液压油输送到一个汇聚点（总管），再分配到用户系统的部件和组件。

B. 这些单位和组件在压力作用下将液压油输入到包括油泵、压力调节器，管路，活门等部位，最后到达一个公共地点，即分配阀，是为了再次分配到其他设定好的系统中。

C. 这些单位和组件将液压油输入到各个压力组件中，包括油泵、压力调节器，管路，活门等。后来液压油汇聚到一个通用点（分配阀），为了再分配到其他定义好的系统中。

A. 参考修订FAR21.50的格式，应保持与使用的规范一致。

B. 修订应以FAR 21.50规定为基础，与其规范的格式一致。

C. 修订FAR 21.50规章的格式，应参考使用修订规范的格式要求。

A. If an annunciator panel TRANSIT light fails to illuminate while the corresponding device is in motion, then this light must be considered inoperative.

B. When related device is in operation and if annunciator panel TRANSIT light comes on, so this light does not work.

C. The light is considered to be available if the annunciator panel TRANSIT light goes off when the related device is in motion.

A. 如果阻止正确的部件过来，则出现凹痕是不被允许的。

B. 如果不正确地操作部件，则出现凹痕是不被允许的。

C. 如果不正确地操作部件，则出现划伤是不被允许的。

A. It is permitted to show the legends within the diagram instead of listing at the bottom or on an adjacent page by the abbreviation number.

B. Legends shall be explained in a simple way within the diagram at the bottom or on an adjacent page except for abbreviation with numbers in a list.

C. If the space is enough, the legends shall be stated within the diagram and do not list them by numerical abbreviations at the bottom or on an adjacent page.

A. Landing gear is left for ten minutes.

B. Landing gear should be kept extended for ten minutes.

C. Extend landing gear after ten minutes＇ retraction.

A. In technical texts, you can use abstractions to make sentiments shorter and easier to read.

B. In technical texts, you can use abbreviations to make sentences shorter and easier to read.

C. In technical texts, you can use abstractions to make sentences shorter and easier to understand.

A. Procedures for handling malfunctions or other abnormalities that are not emergent, or potentially emergent may be delayed in this section.

B. This Section may cover procedures for handling malfunctions or other deviations that are not of emergency nature, or involve a potential emergency that may be handled later.

C. This Section may cover procedures for handling malfunctions or other deviations that are not emergent, or involve a potential emergency that may be deterred.

A. When installing the antenna, the arrows must be aligned and point forward.

B. When installing the radome, you must keep the arrow pointing forward.

C. When you install the antenna, the alignment arrow must point forward.

A. 如果电瓶需要断电，则断掉电源。

B. 如果电瓶需要充电，则继续接通电源。

C. 如果需要更换电瓶，则接通电源。