490.Connect the fittings to the hydraulic test bench.

A. 包含飞机持续适航程序的主要文件是飞机的维修手册。

B. 主要文件包括飞机初始适航程序,称为飞机维修手册。

C. 飞机维修手册的主要文件包括飞机持续运行程序。

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. Each manufacturer is expected to abide by the Specification content and arrangement without any deviation in order to reasonably achieve the objectives of this Specification (enhance safety,reduce efforts,minimize costs).

B. It is mandatory that each manufacturer adhere to the Specification content and arrangement to achieve the objectives of this Specification (enhance safety,reduce efforts,minimize costs).

C. Each manufacturer is expected to adhere to the Specification content and arrangement reasonably so as to enhance safety,reduce efforts,and minimize costs which are the objectives of this Specification.

A. 方向舵用于偏航控制,就是控制飞机绕立轴的运动。

B. 方向舵用于横滚控制,就是控制飞机绕横轴的运动。

C. 方向舵用于俯仰控制,就是控制飞机绕纵轴的运动。

A. Those units means that they can prevent it from eroding.

B. Those units provide a method of deicing.

C. Those units provide a way to prevent the formation of ice.

A. 燃油温度传感器的电阻随燃油温度的变化而变化。

B. 燃油测温包的阻抗改变燃油的温度。

C. 电感改变燃油测温灯泡的燃油温度。

A. This software is only acceptable by the assigned handling system.

B. This software is compatible only with the specified operating system.

C. This software only corresponds to its designed operating system.

A. 如果有必要,增加更多垫片。

B. 增加更多气源是有必要的。

C. 如有必要,添加更多汽油。

A. The delivery of the aircraft is required to ensure its airworthiness,therefore it is subject to customer inspection procedures.

B. The airplanes are airworthy because they were delivered in accordance with advised inspection procedures.

C. The airplanes are delivered with mandatory inspection procedures to ensure their airworthiness.

A. 按照服务公告 2243,所有开裂的接耳都有两个凸缘衬套安装在接耳孔中,或者在生产时解决直衬套与安定面配合 U 型槽失配的早期问题。

B. 根据服务公告 2243 或在生产中,所有出现裂纹的接耳都在接耳孔中安装了两个凸缘衬套,以消除直衬套移入到安定面的配合 U 型槽中的早期问题。

C. 根据服务通告 2243,在生产过程中给所有出现裂纹的接耳孔中都安装了两个凸缘衬套,解决了之前直衬套游移到安定面配合 U 型槽的问题。

D. B.根据服务公告 2243 或在生产中,所有出现裂纹的接耳都在接耳孔中安装了两个凸缘衬套,以消除直衬套移入到安定面的配合 U 型槽中的早期问题。

E. C.根据服务通告 2243,在生产过程中给所有出现裂纹的接耳孔中都安装了两个凸缘衬套,解决了之前直衬套游移到安定面配合 U 型槽的问题。