947、 Mechanical power is produced by electric motors that are mainly used to drive pumps, for example,
fuel and hydraulic pumps or to drive ‘a valve to the commanded position in the fuel, hydraulic or air
conditioning system or to move mechanical parts like doors and cargo containers. 机械动力是由电机产生的,
主要用于驱动泵,例如燃料泵和液压泵,或驱动阀门到燃料、液压或空调系统的命令位置,或移动机械部
件,如门和货物集装箱。

A. 　 A brush is cleaned by the filter element.

B. 　 The filter element and a brush are clean.

C. 　 Use a brush to clean the filter element.

A. 　 Each electrical system is identified by a code.

B. 　 Each code of electrical system is identified.

C. 　 Each system is identified by an electrical code.

A. 　加入溶剂使油漆变得更稀薄

B. 　加入溶剂使油漆变得更稳定

C. 　在油漆里加入更多的溶剂

A. 　 If there is hum from the loudspeaker, don’t adjust the potentiometer

B. 　 Adjust then potentiometer unless hear a hum from the loudspeaker

C. 　 Adjust the potentiometer until the loudspeaker no longer hums.

A. 　长的复合句可以通过垂直列表简化以便理解

A. 　 The exit doors are mainly used for passenger boarding

B. 　 The exit doors are only used for evacuation.

C. 　 The exit doors are not only used for the passengers to evacuate from the airplane but also used for normal exit。.

A. 　 小心地把阀组装在其位置上,并安装封圈和螺栓

B. 　 小心地把阀组件放置到位,并安装垫片和螺栓

C. 　小心地把组件阀放置到位,并安装垫片和螺帽

A. 　当你拆下罩环时,小心不要损坏法兰组件

B. 　当你拆下冠环扇形件时,小心不要造成法兰盘损坏

C. 　拆下法兰盘时,小心不要造成冠环扇形件损坏

A. 　确保流经管路的液体没有气泡。

B. 　确保管路渗漏出的油液没有气泡。

A. 　用干净的棉布浸湿水后清除除污剂。

B. 　用清水浸湿并清洗带有洗涤剂的干净棉布。

C. 　用干净的棉布清除污渍,再用清水洗涤。