If the filters become clogged after an unusually short time, send them to the laboratory for analysis of the contamination.

A. A surge tank drain single valve is on the outside fuel tank end rib in main tank 1 and main tank 2.

B. A surge tank drain one way value is on the inboard fuel tank end rib in main tank 1 and main tank 2.

C. A surge tank drain check valve is on the outboard fuel tank end rib in main tank 1 and main tank 2.

A. 确保指示灯点亮后叶片展开。

B. 确保叶片打开时指示灯点亮。

C. 确保叶片展开的过程中指示灯点亮。

A. Long sentences are easy to read.

B. Long sentences are difficult to read.

C. Short sentences are difficult to understand.

A. Put the repair patch accurately on the damaged area.

B. Put the repair patch on the correct damaged area.

C. Correctly put the repair sealant on the damaged parts.

A. 在可能的情况下，例子、相关条件和 技巧应与图表的同一页呈现。如果没有足够的空间包括必要的信息，那么应该使用图表对面的那一页呈现。

B. 如可能，示例、相关条件和技术应与表格显示在同一页面上。空间不够时，可续页。

C. 如可能，示例、相关条件和技巧应与图表放置在同一页面内。空间不够时，可显示在正对图表的那一页。

A. 接通液压时应确保手柄未接触止动点。

B. 液压释压时，确保手柄未触碰到止动点。

C. 使用液压时应确保控制手柄持续移动。

A. Elevator move is limited by the move of the elevator power control units.

B. Elevator trip is limited by the move of the elevator power control units.

C. Elevator travel is limited by the stroke of the elevator power control units.

A. 用标签识别拆下的零件，此方法将有助于随后的装配过程。

B. 保存好拆下标签的零件，此方法将有助于随后的装配过程。

C. 用标签识别拆下的零件，此方法将有助于子部件的安装。

A. The turbo engine includes a compressor bleed system, air cooling system, hot air system, and engine starting system. The compressor bleed system can control the airflow through the engine, and the air cooling and hot air systems are used for engine anti-icing.

B. The turbo engine includes a compressor exhaust system for controlling the airflow through the engine, a cooling air system for engine icing, and an engine starting system.

C. The turbine engines include compressor bleed systems used to control flow of air through the engine, cooling air systems, heated air systems for engine anti-icing, and engine starting systems.

A. Depressurize the system to 150 bar with the handle pump.

B. Pressure the system to 150 bar with the hand actuator.

C. Pressurize the system to 150 bar with the hand pump.