691、All three bracket holes must align with the fuel tube.

A. 　 Lubricate one side of the washers.

B. 　 Lubricate one side of the seals.

C. 　 Wash one side of the washers.

A. 　 给表面抛光直到它发亮

A. 　安装指示器时将其向后方倾斜。

B. 　为了安装指示器,应将其向后移动。

C. 　安装指示器时将其向前移动。

A. 　那些说明可以作为定期维修所必需的参考

B. 　那些指令是执行定期维护所必需的

C. 　这些指示必须进行有计划维修

A. 　 Disconnect the connection. This connection is downstream of the valve.

B. 　 Disconnect the connection. The valve is downstream of the connection.

C. 　 Disconnect the valve. The valve is downstream of the connection.

A. 　控制组件的出口压力值,否则它不能稳定在正确压力范围。

B. 　输出控制组件的压力,该组件不能稳定在正确压力范围。

C. 　控制组件出口压力值不能稳定在正确压力范围。

A. 　 Hinge the towing arm up to the nose gear.

B. 　 Hook the towing arm up to the nose gear.

C. 　 Fix the towing arm up to the nose gear.

A. 　确保舱门与其附近表面平齐。

B. 　确保使用与舱门表面相似的材料对舱门进行打磨。

C. 　确保舱门材料与其附近表面材料相同。

A. 　把软管的两端连接起来。

B. 　把两端和软管串起来。

C. 　把孔的两端连接起来。

A. 　 Despite the pressure decreases, the switch must stay closed.

B. 　 Although the pressure decreases, the valve must stay closed.

C. 　 In spite of the decreases of the pressure, the door must stay closed.