Blow through the tubes to remove the remaining fluid.

A. The correction installation of the upper drag strut can prevent the retraction of the lower drag strut.

B. If the upper drag strut is installed improperly, the lower one will be hit during retraction.

C. The removal of the upper drag strut has to be done properly so that the lower one can fully extend.

A. “力臂”是物体重心到基准面的水平距离。

B. “力臂”是物体重心到参考面的垂直距离。

C. “力矩”是物体中心到参考基准面的距离。

A. 维持发动机运转20分钟。

B. 使发动机怠速运转20分钟。

C. 快速运行发动机20分钟。

A. Misunderstanding will occur if a word is only understood by a large amount of people in a special technical area.

B. If a word is only known by quite a small amount of people in a special technical field, there will be communication interference.

C. If a word is only understood by a very small number of people in a specific technical area, it will cause interference in communication.

A. The numbering of paragraphs and subparagraphs within a section is not required.

B. No numbers of paragraphs and subparagraphs is required in a section.

C. The numeral order of the paragraphs and subparagraphs is unnecessary in a section.

A. Smooth the cargo-compartment door levers.

B. Polish the cargo-compartment door wheels.

C. Lubricate the cargo-compartment door handles.

A. 描述飞机发动机时，应说明新发动机和拆装后发动机的正确维修操作方法。

B. 描述飞机发动机时，应说明新发动机和损坏后发动机的正确操作和保养。

C. 描述飞机发动机时，应说明全新发动机和磨合期后发动机的正确操作和保养。

A. 指示器显示储压器已满。

B. 仪表显示油箱已满。

C. 指示器显示油箱已满。

A. 此门在飞行中部分打开，在地面时完全打开。

B. 此门在飞行中完全打开，在地面时完全打开。

C. 此门在飞行中部分打开，在地面时也部分打开。

A. During the retraction test, keep a close watch on the monitor.

B. Continuously observe the indications after the retraction test.

C. Monitor the indications during the retraction test.