774、如果安装了报警器面板,解释一下它是如何工作的

　If a display appears on the annunciator panel, it explains that how the system works.

　An annunciator device is displayed on the panel, which shows how it works.

　If an annunciator panel is installed, explain how it operates.

正确答案：C

解析：

解析:注释:install 安装。explain 解释。

714、Increase the pressure slowly ( not more than one turn each minute)

713、In the alternative, the acronym CAP may be used

712、If you do not safety the door it is possible that strong winds will cause damage to the structure. 如果你不锁好门，强风可能会对结构造成破坏。

711、If you cannot engage the rod and the piston, the length of the new rod is possibly incorrect

710、If this maneuver cannot be performed safely, a warning against attempting it shall be provided.

709、If the RAT is retracted, slowly and fully extend the RAT and make sure that it does not touch other parts.

708.If the format parameter or rule is inappropriate to the type of airplane, equivalents likely to achieve thesame objective may be used

707、If the error is more than 3 deg, calibrate the compass.

706、If possible, always tell your reader what can occur if the safety instruction is not obeyed. 如果可能的话，总是告诉读者如果不遵守安全指示会发生什么。

705、Hydraulic fluid is dangerous for your eyes. 液压油对眼睛有害。