如有必要，增加一个垫片。

A. Ensure the oxygen tubes are completely clear. If oxygen is mixed with oil or compound together, it will form an explosives. Explosion can cause damage to equipment or injury to personnel.

B. Make sure that the oxygen tubes are fully clean. Oxygen and oil or grease make an explosive mixture. An explosion can cause injury or death to personnel.

C. Guarantee the oxygen tubes are completely free of dirts. Oxygen, oil and grease can combine to form an explosive oxides. Explosions can cause casualties.

A. 描述飞机燃油系统时，应说明交替供油和燃油运输（如适用）。

B. 描述飞机燃油系统时，应提供交输供油和燃油传输（如适用）相关描述。

C. 描述飞机燃油系统时，应说明交叉供油和燃油传递（如适用）。

A. Emergency Lighting is a independent subsystem used to provide illumination in case of primary electrical power failure.

B. Urgency Lights that supply the lights when the major electronic power fails is a separate subsystem.

C. Ambulance Lights is used to supply lights if the main electrical sources malfunctions as an independent subsystem.

A. Make a little oil to the threads of the two bolts.

B. Apply a small quantity of oil to the threads of the two bolts.

C. Apply a small quantity of oil to the threads of the two nuts.

A. If the drain hole is blocked, clean it.

B. If the drain hole is leaked, clean it.

C. If the drain hole is locked, clean it.

A. 将电缆折成相等长度的三段。

B. 将电缆剪成相等厚度的三段。

C. 把电缆剪成长度相等的三段。

A. Functional check L VHF radio found statis interference and noise.

B. Functional check of L VHF radio shown turbulence and static noise.

C. Functional check of L VHF radio revealed interference of static with noise.

A. 在涡轮发动机驱动的飞机上，排气温度指示器是用来识别各种功率设置下的富油流量混合气的仪器。

B. 对于活塞发动机驱动的飞机，排气温度指示器能够显示不同功率设置时贫油状态下的油气混合气。

C. 在涡轴发动机驱动的飞机上，排气温度指示器是用来识别各种功率设置下的贫油流量混合气的仪器。

A. 如果有必要，增加更多垫片。

B. 增加更多气源是有必要的。

C. 如有必要，添加更多汽油。

A. Using the wet wing concept, all fuel is stored in three tanks. These three tanks include main tank 1, main tank 2 and center tank. Center tanks are made up of the main wing structure.

B. Using the wet wing concept, all fuel is stored in three tanks. These three tanks include main tank 1, main tank 2 and center tank. These three tanks are made up of the main wing structure.

C. Using the wet wing concept, all fuel is stored in three tanks. These three tanks include main tank 1, main tank 2 and center tank. The primary wing structure consists of main tank 2 and center tank.