Use the specified tool to seal the opening.

A. Because of the risk of contamination, you must do this task in a very clean environment.

B. To prevent environmental pollution, this task must be done in a very clean area.

C. In order to prevent contamination, the task you must do is to find a very clean environment.

A. 对现有分析进行了审查，以确定可能表现出较低安全裕度的部件和区域。

B. 对现有分析进行复核，对部件和区域进行标识，以显示出较低安全裕度。

C. 对于安全裕度较低的部件和区域进行标识并进行了现场分析审查。

A. 这个单元的主要函数是控制燃油流动。

B. 这个装置的主要功能是控制燃油流量。

C. 这个组件的辅助功用是控制燃油流动。

A. The needle moves horizontally along the gage.

B. The pointer moves vertically along the scale.

C. The indicator moves longitudinally along the edge.

A. If ordering any wire bundles from Boeing is mandatory, operators has the right to purchase the bundles from other supplier and ask them to provide the base wire bundle number (61-30396 in this case) and tail number of the airplane.

B. It is a necessity for the operators to provide the base wire bundle number (61-30396 in this case) and tail number of the airplane on which the bundle is to be installed if ordering any wire bundles from Boeing is necessary.

C. Operators should provide the number(61-30396 in this case) of the airplane where the bundles are to be installed on if ordering any wire bundles from Boeing is necessary.

A. 把前侧或后侧座椅移动大约0.50英寸（12.70毫米）使座椅滑轨接头上的凸缘与座椅滑轨里的孔对齐。

B. 向前或后移动座椅大约0.50英寸（12.70毫米）使座椅滑轨接头上的凸缘与座椅滑轨里的孔对齐。

C. 把前侧或后侧座椅移动大约0.50英寸（12.70毫米）使座椅滑轨接头上与座椅滑轨里的孔对齐。

A. 检验/查找部分应提供访问和检验或查找系统、单元或区域所需的信息和程序。

B. 检验/检查部分应提供接近和检验或检查系统、装置或区域所需的信息和程序。

C. 监控/检查部分应提供访问和监控或检查系统、装置或区域所需的信息和程序。

A. Refer to the general information in addition to engine operation limits, guidelines and special procedures.

B. For general information, refer to engine operation limits, guidelines and special procedures.

C. Refer to engine operation limits, guidelines and special procedures besides general information.

A. 那些组件和部件存储、调节并向旅客和机组输送氧气，包括气瓶、释压活门、关断活门、出口、调节器、面罩等。

B. 气瓶，释压活门，关断活门，出口，调节器，面罩等组件和部件储存氧气，并将调节后的氧气提供给乘客和机组。

C. 那些旅客和机组氧气系统的相关组件和部件存储、调节、输送氧气，包括气瓶、释压活门、关断活门、出口、调节器、面罩等。

A. 放出适量燃油。

B. 注入大量的滑油。

C. 加入所需量的滑油。