981.使用滑石粉来发现外部泄漏。

A. 分配系统是指系统中用于将高压或低压空气分配到用户系统的那部分。

B. 分布系统是指系统中用于向正在运行中的系统分配高压或低压空气的那部分。

C. 配电系统是指系统中用于将高压或低压空气分配到有需求系统的那部分。

A. The oil supply element and the three magnetic particle testing detectors are in the lubrication unit.

B. The oil supply filter and the three chip detectors are in the lubrication unit.

C. Position the oil supply filter assembly and the three magnetic chip detectors in the lubrication unit.

A. 分步执行这两个步骤。

B. 依次执行这两个程序。

C. 同时做这两个步骤。

A. After the system is pressurized,the elevators will drop down no matter where the rigging pin is installed.

B. Without the rigging pin,the elevators will go down when there is no pressure in the system.

C. The rigging pin can prevent the elevators from retracting and expanding when the system is de- energized.

A. 对现有分析进行了审查,以确定哪些部件和区域可能表现出较低安全边际。

B. 对现有分析进行了审查,以确定可能显示出较低安全裕度的组件和区域。

C. 现有的分析被审查,以确定可能阻止安全边际降低的部件和区域。

A. The system part is used to support the head of the aircraft when the aircraft is on the ground.

B. The part of the system is to keep the aircraft nose on the ground.

C. That portion of the system supports the nose of the aircraftwhile the aircraft is on the ground.

A. 本节中所规定的各项空速应为指示空速。假设仪表误差为零,尽可能使信息直接可用。

B. 本节中使用的空速应在指示空速中规定,假设仪器误差为零,以使信息尽可能直接可用。

C. 本节中使用的空速代表指示空速。由于仪表误差为零,所以信息直接可用。

A. Use some auxiliary screws to assemble the unit temporarily.

B. You shall use some additional screws to install the unit permanently.

C. Temporarily disassemble this unit using some auxiliary screwdrivers.

A. 纠正措施在适航指南中给出,如检查,维修或改装,在适航指南中详细说明,或在另外一个文件中给出,如制造厂家服务通告,该服务通告在适航指南中作为参考。

B. 适航指令描述的纠正措施,比如检查、修理或改装的具体要求,可由适航指令详细给出,或包含在另外一个文件中,如制造厂家服务通告,该服务通告在适航指令中列为参考文件。

C. 适航指令或另一个文件,如制造厂家服务通告可详细给出检查、修理或大修等纠正措施,该服务通告刊登在适航指令中作为参考。

D. C.适航指令或另一个文件,如制造厂家服务通告可详细给出检查、修理或大修等纠正措施,该服务通告刊登在适航指令中作为参考。

A. You can use all standard English parentheses except the colon.

B. You can use all standard English contraction marks except the hyphen.

C. You can use all standard English punctuation marks except the semicolon.