The indicator shows the level of hydraulic fluid in the reservoir.

A. 系统的这一部分能够为飞机在地面上提供主要支撑，包括减震支柱、轮架轴、阻力杆、门、连杆、固定螺栓等。

B. 这部分系统为飞机在地面上提供主要支持，包括控制装置、管道、阻力支柱、门、连杆、上下门闩等。

C. 这部分系统为飞机在地面上提供主要支持，包括旋转密封套、管道、防滑装置、门、连杆、连接栓等。

A. 如果可以更早地显示维护页面，则能够显示之前的测试运行数据。

B. 它会显示上次的试验数据，如果你早些展示维护页面。

C. 如果过早地显示维修页面，它将显示前一次的测试运行数据。

A. 把O形封圈浸泡在液压油里面。

B. 防止液压油腐蚀O形封圈。

C. 用液压油润滑O形封圈。

A. The introduction should be included in an alphabetical index by subject.

B. An alphabetical index by subject is to be included in the introduction.

C. The introduction includes an alphabetical index subject.

A. Each electrical system is identified by a code.

B. Each code of electrical system is identified.

C. Each system is identified by an electrical code.

A. A maximum distance of 50 feet is required between consumable materials and the work area.

B. Keep flammable materials at a minimum distance of 50 feet from the work area.

C. Explosive materials must be kept at least 50 feet away from the work area.

A. The tank recirculating system lets the air in or out of the fuel tanks if necessary.

B. The tank absorbing system lets the air in or out of the fuel tanks as necessary.

C. The tank venting system lets the air in or out of the fuel tanks as necessary.

A. 其他信息可能会显示在封面上。

B. 其他信息可能会在盖板上留下。

C. 其他信息可能会显示在目录上。

A. All sensors provide implied information.

B. All sensors supply indication data.

C. All sensors can receive indication data.

A. Correct operation of the parts does not allow dents to occur.

B. Dents that have an influence on the correct operation of the parts are not allowed.

C. Dents can prevent correct operation of the parts, so they are not permitted.