Speech communication utilizes voice modulated electro-magnetic waves to transmit and/or receive messages from air-to-air or air-to-ground installations.

A. 涂抹两层保护性化合物，以防止液压油损坏密封胶。

B. 运用两层保护性化合物，以保护液压油对密封胶的损害。

C. 运用两层保护性成分，以防止密封胶对液压油造成损害。

A. 注：在随后的测试中，当来自交输进口的燃油流量超过5 毫升/分钟时，你将获得开启压力。

B. 注：在随后的测试中，当来自交输进口的燃油流量超过5 毫升/分钟时，你将获得刮痕压力。

C. 注：在随后的测试中，当来自横穿进口的燃油流量超过5 毫升/分钟时，你将获得刮痕压力。

A. The emergency procedures check list should be in concise, abbreviated form designed to remind pilots of items to check without providing details concerning the operation of any system.

B. The normal procedures check list which should be in concise, abbreviated form is designed to tell pilots of items to check without providing details concerning the operation of any system.

C. The content of the emergency procedures check list should be in concise, abbreviated form and its purpose is to remind flight attendants of items to check with providing details concerning the operation of any system.

A. 确保不要使用不相关的单词，因为这将改变短语动词的意思。

B. 确保不要将无关的单词连在一起，因为这会改变名词词组的意思。

C. 确保不要连用意思相反的单词，因为这会改变固定搭配的意思。

A. The aim of STE is that readers all over the world can easily understand the technical texts and that writers who are responsible for preparing technical texts know how to prepare them in a easy method.

B. The objective of STE is to provide writers with general principles on how to prepare technical documents in a clear, simple and distinct manner that readers all over the world can easily understand.

C. The function of STE is to describe how to prepare technical texts in a easy, clear and specific way and to allow readers all over the world to understand difficultly.

A. 将管子截成正确的角度。

B. 将管子放置在正确的位置。

C. 把管子弯到正确的半径。

A. 在向跑道进近中，航道指示器的偏离指针提供向上或向下和向左或向右飞的指令。

B. 在接近跑道过程中，航道指示器的背离指针提供向上或向下和向左或向右的命令。

C. 在接近跑道过程中，课程指示器的偏离指针提供向上或向下和向左或向右飞的指令。

A. Total number of rules is decreased from 65 to 53.

B. Total number of rules ascended from 65 to 53.

C. Total number of rules increased from 65 to 53.

A. After three full cycles, extend and retract the actuator.

B. You should extend and retract the actuator through three complete cycles.

C. Do nothing to the actuator after three complete cycles.

A. 关闭流量控制和空调组件的关断活门。

B. 关闭空调组件的流量控制和关断活门。

C. 至于空调组件，关闭流量控制和关断活门。