459、The OEUs change 115v Ac from the main bus to 5v AC for row call lights and 12vAC for the reading lights.

A. 　 With the aid of the component manufacturer, all components in this chapter can be overhauled in any workshops with different qualifications.

B. 　 Without the data supplied by the component manufacturer, it is possible for the most qualified shop to overhaul any components included in this chapter.

C. 　 You must overhaul any of all components in this chapter in an eligible shop on the basis of data provided by the component manufacturer.

A. 　 Clean the surface to make sure that the sealing is satisfactory.

B. 　 Clean surfaces to ensure the bonding as required.

C. 　 Clean the surface to make sure that the bond is satisfactory.

A. 　拆下附着在法兰到盖子上的四个螺钉。

B. 　拆下四个螺钉,将法兰附着到盖子上。

C. 　拆下将法兰固定到盖上的四个螺钉。

A. 　从安装位置向上提起气瓶

B. 　向上提起做动筒到安装位置

C. 　提起并安装气缸到位

A. 　 Where a low flow or undercooling condition occurs, the low flow sensor sends an alarm signal to the flight
compartment for warning.

B. 　 When a low flow or not sufficient cooling condition occurs, the low flow sensor supplies an alarm signal to
the flight compartment for annunciation.

C. 　 When a low flow or insufficient cooling condition occurs, the low flow sensor applies a alarm signal to the
flight compartment for caution

A. 　为卫生间和厨房提供冷气。

B. 　为卫生间和厨房提供暖气。

C. 　为卫生间和厨房提供通风。

A. 　工作准备总是第一个步骤,收尾或收工是最后一个步骤

B. 　工作准备总是第一个步骤收尾或收工是接下来的步骤

C. 　第一个步骤有时是工作准备,收尾或收工是接下来的步骤

A. 　 The manufacturer is hall include no less than one airplane model in the Maintenance Manual if required.

B. 　A The manufacturer is desired to include more than-one airplane model in the Maintenance Manual.
c、The Maintenance Manual may include more than one airplane model at the discretion of the manufacturer.

A. 　将 O 形环安装在锥形轴承的内部凹槽中

B. 　将 O 形环安装在圆柱形轴承的内部凹槽中

C. 　将 O 形环安装在球形轴承的内部凹槽中

A. 　参考的技术文件必须包含如勤务通告、勤务信函等

B. 　服务通告、勤务信函包含在技术参考文件清单中

C. 　技术参考文件包括必要的文件清单,如服务通告、服务信函等