Warning: Before you close the hatch, make sure that no persons are in the crew rest compartment. When the hatch is closed, there is no airflow to the compartment and there is a risk of suffocation.

A. Lubricate the elevator tab hinges.

B. Lubricant the elevator tab links.

C. Grease the aileron tab hinges.

A. This compound is poisonous.

B. This composite is toxic.

C. This agent is volatile

A. Vertical pages instead of horizontal are preferred for all types of publication.

B. Horizontal pages are more preferable for all types of publication than vertical ones.

C. Both vertical and horizontal pages are rather preferable for all types of publication.

A. 如果你看到染色，拆卸部件。

B. 如果你看到变色，更换部件。

C. 如果你看到有颜色，移除部件。

A. 降低氮气压力至120 磅/平方英寸。

B. 减小氮气压力120 磅/平方英尺。

C. 把氮气压力减小120 磅/平方英尺。

A. Adjust the tension in the wires to the correct value.

B. Adjust the tension in the cables to the correct value.

C. Adjust the torque in the cables to the correct value.

A. Turn the handle of the door until the lower gate is lifted.

B. For lowering the upper door, door handle should be turned.

C. The lever of door should be turned until the lower door opens.

A. Reinstall the supply ducts in the wing de-icing system.

B. Install the telescopic ducts in the wing de-icing system.

C. Install the elastic ducts in the wing anti-icing system.

A. CRES causes magnesium, aluminum, or cadmium to corrode when it touches these metals.

B. Stainless steel corrodes once touching magnesium, aluminum, or chromium metals.

C. Magnesium, aluminum, or chromium metals shall be protected from the corrosion caused by CRES.

A. 在升降飞机时，要确保操作升降设备的人员接受过恰当的培训并具备相应的知识。

B. 在对飞机进行平衡、顶升或放下时，确保人员接受过升降设备的培训并掌握相关技能。

C. 当水平放置飞机或顶升飞机时，确保操作升降设备的人员学过培训知识。