150.To extinguish a possible fire,portable fire extinguishers are installed in these areas.

A. Remove thesmooth areas with cotton cloth if you find them.

B. If you find alligatored areas,remove them with cotton cloth.

C. If there are rough areas,remove them with emery cloth.

A. The gyroscope will become stable before less than 15 seconds.

B. The gyroscope will become stable for at least 15 seconds.

C. After about 15 seconds,the gyroscope will become stable.

A. To depressurize the braking system,operate the hand pump handle through its full travel.

B. To inflate the braking system,operate the hand pump handle through its full travel.

C. To bleed the braking system,operate the hand pump handle through its full travel.

A. 将 O 形环安装在锥形轴承的内部凹槽中。

B. 将 O 形环安装在圆柱形轴承的中部凹槽中。

C. 将 O 形环安装在球形轴承的内部凹槽中。

A. Lubricate the elevator tab hinges.

B. Lubricant the elevator tab links.

C. Grease the aileron tab hinges.

A. 将导轨嵌放在轴上。

B. 将套筒放在支杆上。

C. 把吊环钩在钩环上。

A. 对邻近区域做检查。

B. 对表面区域做检查。

C. 对内部区域做检查。

A. This tool is mandatory.

B. This tool is optional.

C. This tool is necessary.

A. 在开始检查前,你应该拆除接近门和整流罩。

B. 在开始检查前,你应该拆除登机门和整流罩。

C. 在开始检查前,你应该拆除舱门和组件。

A. Solenoid valves shall be shown with a notation.The notation indicates the spring is loaded by the valve to the open or closed position.

B. Solenoid valves shall be shown with a symbol.The valve indicates whether the valve is spring- loaded to the open or closed position.

C. Solenoid valves shall be shown with a mark.The mark indicates whether the valve is spring- loaded to the open or closed position.