将1号自动定向仪调谐至已知频率。

A. 逆时针转动调节器60度。

B. 逆时针旋转调节器时应当增加60度。

C. 逆时针旋转调节器，每次增量60度。

A. If the unit is not modified, its service life will be possibly shorter.

B. Without the modification of the unit, its service life is likely shorter than present.

C. Without the modification, it is possible that the service life of this unit will be shorter than usual.

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. 盖子朝下的时候，是开关在开位的一种保护。

B. 封面在下面的时候，是开关在开位的保险。

C. 盖子朝下的时候，是开关在开位的保险。

A. 当襟翼完全放出后，马达停止。

B. 当襟翼运达终点时，马达会停止。

C. 当挡板的行程结束时，电机停止。

A. 飞机或其系统的缺陷经常被第三方给出文字描述。

B. 总的来说，对飞机或系统的排故不受第三方的限制。

C. 一般来说，在描述飞机或其系统时，应该使用第三人称。

A. 关闭空调管道中的气流以备检查。

B. 关断待检查的空调管道中的气流。

C. 在空调管道中阻断气流为检查做准备。

A. 燃油排放系统保持油箱压力接近环境压力。太大的压力会引起机翼结构损坏。

B. 燃油通风系统保持油箱压力接近大气压力。压差过大会引起机翼结构损坏。

C. 燃油通风系统确保油箱压力在接近大气压时保持稳定。太大的压力变化会引起机翼结构损坏。

A. Present the examples, associated conditions and technique on the possible page of the chart and use the page including the chart to concise the necessary information if the space is insufficient.

B. Present the chart, examples, associated conditions and technique on the same page if possible and use the page facing the chart if the space is insufficient for the necessary information.

C. Try to place the examples, associated conditions and technique on the same page as the chart if possible and use another page including the chart to describe the necessary information when the space is not sufficient.

A. Install caps on the receptacles to make sure that unwanted material does not go into the receptacles.

B. To ensure foreign objects do not get into the connectors, you should install caps.

C. To keep the unwanted material away from the receptacles, install plugs on them.