2972.用软布对表面抛光,直到它变得有光泽。

A. Oxygen occurs occasionally.

B. Oxidation occurs very easily.

C. Oxygen happens very easily.

A. 描述飞机机翼襟翼、俯冲制动或扰流板系统时,应描述其应用如何影响俯仰姿态、空速、配平和失速速度。

B. 描述飞机机翼翼尖、俯冲制动或扰流板系统时,应描述其应用如何影响俯仰姿态、表速、配平和失速速度。

C. 描述飞机机翼襟翼、俯冲减速板或扰流板系统时,应描述各自工作时如何影响俯仰姿势、空速、配平和失速速度。

D. C.描述飞机机翼襟翼、俯冲减速板或扰流板系统时,应描述各自工作时如何影响俯仰姿势、

E. C.描述飞机机翼襟翼、俯冲减速板或扰流板系统时,应描述各自工作时如何影响俯仰姿势、空速、配平和失速速度。

A. 回顾现有的分析结果,确定了安全性能表现较低的部件和区域。

B. 只有对现有的分析结果进行复审,才能发现安全性较低的部件和区域。

C. 对现状分析进行审查,以找出可能安全边际较低的部件和区域。

A. The aircrft is taxiing to China on the runway.

B. The aircrft is running to China on the ramp.

C. A Chinese aircrft is taxiing on the runway.

A. Visual difference is acceptable between the previous surface and the new surface.

B. There should be no visual difference between the initial surface finish and the new surface finish.

C. It is forbidden to have acoustic difference between the former surface finish and the new surface finish.

A. 调整测试描述应该提供指导来完成测试或检查,来保证整个操作组件的系统、子系统或组件装配。

B. 为确保整合系统、子系统和单元组装件的运行,调整测试的说明应该提供指示来完成测试或检查。

C. 调整测试说明应提供完成测试或检查的指示,以确保作为系统、子系统或单元组装件的操作性组件的完整性。

D. C.调整测试说明应提供完成测试或检查的指示,以确保作为系统、子系统或单元组装件的操作性组件的完整性。

A. 用真空清洁器和刷子清洁设备的内部及其底座。

B. 用真空清洁器和刷子清洁设备的外表面以及安装架。

C. 真空清洁设备及硬件设施的表面涂层。

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. Setting cable tension,flight control surfaces travel limitsand stops are the main tasks of rigging.

B. Cable tension set,flight controls travel limits adjustment and travel stops set are the rigging procedures.

C. Rigging involves setting cable tension,adjusting travel limits of flight controls,and setting travel stops.

A. 确保表面没有铁锈。

B. 确保表面没有灰尘。

C. 确保表面没有油渍。