Do not use fuel with unknown properties.

A. 保留勤务部件，更换那些损坏的。

B. 报废损坏的部件后，保留所有可用的。

C. 保留所有可用的部件，报废那些损坏的。

A. It is necessary to replace the fitter.

B. It is mandatory to replace the filter.

C. It is prohibited to replace the filler.

A. Solvents can avoid damage to paint.

B. Solvents can cause damage to paint.

C. Solution can cause damage to paint.

A. Make sure that the flaps are retracted and the aileron trim handwheel is in the zero position.

B. Ensure that the flaps are partially extended and the aileron trim handwheel is centered at zero.

C. Make sure that the flaps are raised and the aileron trim handwheel is set to non-zero position.

A. Operate the dimmer switch and make sure that the intensity of the light changes.

B. Control the light knob to ensure that the light strength changes.

C. Turn the light regulator on to adjust the luminous intensity.

A. 变更一些词性的缩写，使其与标准缩写一致。

B. 一些词性缩写的变化与标准缩写一致。

C. 更新标准缩写使其满足一些词性缩写变更的要求。

A. Describe how to operate the safety belt and wire harnesses.

B. Tell the way to use the seat and shoulder belts.

C. The seat and shoulder harness should be used by the pilot.

A. The antenna should be put in the right position on the airplane surface.

B. There is an antenna positioning in the suitable place on the airplane skin.

C. Correct the antenna position on the airplane surface.

A. 有些功能不存在。

B. 有些功能不可用。

C. 有些系统不可用。

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.