Make sure that the fuel load is equal on each side of the aircraft centerline.

A. 安全扫描仪检测金属物体。

B. 保证扫描仪检测金属物体。

C. 安全扫描缺损金属物体。

A. According to instrument error and compressibility effects, Outside Air Temperature is corrected.

B. Outside Air Temperature is set to avoid instrument error and compressibility effects.

C. Due to instrument error and compressibility effects, Outside Air Temperature is modified.

A. Make the attitude of the valves the same.

B. Make the positions of the valves agree.

C. Make the altitude of the valves agree.

A. Attach the aft cargo compartment forward bulkhead central panel.

B. Mount the front cargo compartment backward bulkhead center panel.

C. Fix the aft bulkhead forward panel to the forward cargo component.

A. When the required maintenance procedure is not very long and fairly simple, the above combination can be grouped under a title which is called maintenance practice.

B. When the required maintenance procedure is not lengthy and is relatively simple, a combination of the above may be grouped under one heading and called maintenance practices.

C. When the required maintenance procedures are not very long and comparatively simple, the above combinations can be bound under one subject, calling maintenance practices.

A. The swivel nuts on both valves engage threads on an internal stem that loosens or draws tight the valve stem to a metal seat.

B. The rotating nuts on both valves are meshed with the threads on the inner valve stud, so that the valve stud is loosened or tightened to a metal valve base.

C. The swing nuts on both valves engage with the threads on the internal spool, allowing the spool to loosen or tighten to the metal seat.

A. 这些安全预防措施是在维修区工作的最低要求。

B. 这些安全警告满足维修区工作的全部要求。

C. 这些安全提示有必要做为维修区工作要求。

A. The operation rods are connected to the hydraulic feedback.

B. The operation barrels are connected to the hydraulic return.

C. The actuators are connected to the hydraulic return.

A. 应使用比例尺图对飞机的总体布局进行说明，该比例尺图由平面图、侧视图和正面视图组成，并在单页上以垂直顺序展示。

B. 应使用气动布局图对飞机总体安排进行说明，说明内容包括计划、侧面图和正面图，并以垂直顺序在单页上列出。

C. 应在单页上以横向顺序的呈现方式对飞机总体布局和示意图进行说明，包括平面图、侧视图和正面视图。

A. Oxidation occurs very easily.

B. Oxygen occurs very easily.

C. Nitrogen occurs very easily.