To find the middle point, divide the measured clearance by two.

下滑道路径是与跑道的端头成一个固定的角度。

A. The glideslope path is at a constant angle to the threshold of the runway.

B. The glideslope path is at a variable angle to the first end of the runway.

C. The vertical course path is at a fixed angle to the threshold of the runway.

Make sure that there is no blockage in the pipe that prevents airflow.

A. Make sure that there is airflow in the pipe to hinder .

B. Make sure that there is something in the pipe to block the airflow.

C. Make sure that there is nothing in the pipe to hinder airflow.

The new fluid should be checked after thorough mixing.

A. Check the fluid prior to mixing.

B. Prior to checking the fluid, ensure it has been mixed.

C. Never mix the fluid before testing.

Operate the unit for two cycles to remove air from the lines.

A. 操作部件两个循环，从管道排除空气，拆下组件。

B. 操作部件两个循环，排除管道中的空气。

C. 操作部件使空气两次循环，从管子上拆下。

Do not go into the engine test area without approval.

A. 未经保护，请勿进入发动机测试区域。

B. 未经允许不得进入发动机试车区域。

C. 未经批准，请勿进入发动机测试控制中心。

No part of this document may be reproduced in any form without permission in writing from the publisher.

A. 本文件中的任何零件没有出版商的许可不得复制。

B. 本文件中没有任何一个部分是没有得到出版商书面许可的。

C. 未经出版商书面许可， 本文件任何部分不得以任何形式复制。

对于所有飞机在起飞和飞行中（可能）发生的所有的发动机故障(包括部分失效)，均应提供程序。

A. Procedures shall be provided for all airplanes for all cases of engine failure, including partial failure, during takeoff and in flight.

B. Procedures shall be provided for all airplanes for all cases of engine failure, including intermittent failure, during roll out and in flight.

C. Procedures shall be provided for all airplanes for all cases of engine flame out, including parts failure, during takeoff and in flight.

All flow control devices within the system, such as check valves, fuel pumps, accumulators, and relays should be included and indicated. Solenoid valves shall be indicated as such and shall include a notation indicating whether the valve is spring-loaded to the open or closed position. Once a symbol or device is established for a valve or control, it shall be used for this type of unit throughout the manual. The symbols used should be shown and identified in a legend block on the schematic diagram.

A. 系统内的所有流量控制装置，如止回阀、燃油泵、蓄能器和继电器都应包括在内。电磁阀应标明，并应包括一个说明，表明该阀是由弹簧加载到打开或关闭位置。一旦为阀门或控制装置确定了一个符号或装置，它应在整个手册中用于该类型的装置。所用的符号应在原理图的图例块中显示和标识。

B. 系统流程图应对该系统内的所有流量控制装置进行标识，如单向活门、燃油泵、蓄压器和继电器。电磁阀门也应标识，并以注释形式说明该阀门是否使用弹簧加载在开位或关位。一旦确定了各阀门和控制器对应的符号，则应在整个手册中保持一致。

C. 系统内的所有流量控制装置，如止回阀、燃油泵、蓄能器和继电器，都应包括在内并标明。电磁阀应按此指示，并应包括一个符号，指示阀门是弹簧加载到打开位置还是关闭位置。一旦为阀门或控制装置建立了符号或装置，则应在整个手册中将其用于此类装置。所使用的符号应在原理图上的图例块中显示和标识。

使用滑石粉来发现外部泄漏。

A. Use talcum powder to find external leaks.

B. Use titanium powder to detect external leaks.

C. Use limestone powder to examine internal leaks.

此工具是可选的。

A. This tool is mandatory.

B. This tool is optional.

C. This tool is necessary.