2727.为避免污染,必须在非常清洁的环境里执行该任务。

A. 燃油在燃烧室内燃烧。

B. 燃油通过喷嘴进入雾化器。

C. 燃油通过雾化器进入燃烧室。

A. 飞机在地面上,主起落架和门是主要支撑的部分系统,包括诸如减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。

B. 主齿轮和门是飞机系统的一部分,在地面上提供主要支持。这个系统包括减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。

C. 主架和门是飞机在地面提供系统主要支撑的一部分,包括减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。

D. C.主架和门是飞机在地面提供系统主要支撑的一部分,包括减震柱、转向轴、牵引支柱、门、连杆、连接螺栓等项目。

A. The power plant uses an air vent or propeller to produce power.

B. The power plant develops thrust either through the exhaust or through a propeller.

C. The power plant generates propulsion with the aid of the exhaust or a propeller.

A. 如果转子突然停止,请检查进气中是否含有不需要的杂质。

B. 如果转子突然停止转动,检查进气道是否存有外来物。

C. 如果转子突然停止,请检查进气口是否有需要的杂物。

A. Make an estimate of the necessay quantity.

B. Make a record of the necessary quality.

C. Make a note of the necessary quality.

A. 当你选择这些按钮中的其一时,数字字母显示只出现电压和频率。

B. 当你选择这些按钮中的其一时,模拟数字显示只出现电压和频率。

C. 当你选择这些开关中的其一时,模拟数字显示只出现电压和频率。

A. If you use solvent in a closed space,make sure that there is good airflow in the work area.

B. When using composite in confined space,make sure it has good ventilation.

C. You can not use sealant in enclosed space on condition that there is no good ventilation.

A. The system is pneumatically operated and mechanically controlled.

B. Hydraulic power drives the system,while electricity is connected.

C. The system is hydraulically operated and electrically controlled.

A. Compressed air will push contamination into the display unit.

B. The display unit will be contaminated by compressed air.

C. Air pressure will push the dirt into the display unit.

A. When you lift the aircraft on racks,keep the center of the aircraft between these limits.

B. When you lift the aircraft on jacks,keep the center of gravity between these limits.

C. When you lift the aircraft on jacks,the gravity of the aircraft shall be limited.