2506. 确保没有沿翼展移动的迹象。

A. 把钩环挂在升降机上;

B. 用钩环固定住升降机;

C. 用钩环提起升降机;

A. The responsibility of ABC is not to modify the airplanes that belong to STC.

B. It is not STC＇s responsibility to modify ABC＇s aircraft.

C. ABC is not in charge of the aircraft modified by STC.

A. Use a torque wrench only when tighten the nuts for the balance tab .

B. Use only a torque screw to tighten the nuts for the balance tab .

C. To tighten the nuts for the balance tab, use only a torque wrench .

A. 拆卸上游探头,再次测量温度。

B. 将探头向上游移动并再次监控温度。

C. 将探头向上游移动并再次测量温度。

A. 当你使用产生火花的电气设备时,请带上护目镜。

B. 当你使用产生火花的电气设备时,请带上面罩。

C. 当你使用产生火花的电气设备时,请穿上防护服。

A. If the number of failures is more than three, clean the unit.

B. If the number of failures is more than three, replace the unit.

C. If the number of failures is more than three, repair the unit.

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. If you do not safety the door, strong winds must cause damage to the structure.

B. If you do not safety the door, damage to the structure due to strong winds is acceptable.

C. If you do not safety the door, damage to the structure due to strong winds is probable.

A. When an airplane is designed to fly at lower speeds, the turboprop is usually the engine choose.

B. When an airplane is designed to fly at lower speeds, the turboprop is usually the engine chosen.

C. When an airplane is designed to fly at lower speeds, the piston propeller engine is usually chosen

A. A hard landing may be the result of shock loading of the engine.

B. Shock loading of an engine may result in a heavy landing.

C. A heavy landing can cause shock loading of the engine.