Gas pressure in the sense tube holds the fault pressure switch in the closed position. The other two pressure switches close when the gas pressure increases because of an overheat or fire condition.

A. 本规范准备过程中所遵循的（语法）结构规则与FAA在其规章准备过程中所使用的专用规则相同。

B. 在编写本规范时遵循的（语法）结构规则与FAA在编写其规章时通常使用的规则相同。

C. （语法）结构规则遵循该规范的编写，该规范和FAA在编写其规章时通常使用的规则相同。

A. All aircraft engines must meet certain general efficiency, economy, and reliability requirements, which require that the ignition system can provide ignition pulses at the proper time to the spark plug in various weather and other adverse conditions.

B. All aircraft engines must meet certain overall efficiency, economy and reliability requirements, which require the ignition system should provide ignition pulses at appropriate times under meteorological and other unfavorable conditions.

C. All aircraft engines must meet certain general requirements of reliability, economic and efficiency, which dictates the use of ignition systems that deliver the firing impulse to the spark plugs in all kinds of weather and under other adverse conditions.

A. During inspection, if the nuts and washers are removed, recheck them.

B. Take a good place for the nuts and washers removed during inspection.

C. If nuts and washers are removed during inspection, install the new ones.

A. The external diameter must be concentric to the internal diameter.

B. The outer radius and the inner radius must be suitable.

C. The exterior radius must be installed on a common shaft with the interior radius.

A. You can calibrate all the compass systems at the same time.

B. You can fix all the compass systems at the same time.

C. You can calibrate all the magnetic needle systems at the same time.

A. “环境系统”一节应包括安全操作氧气系统时的必要信息，如系统能力和耐久性。

B. “环境系统”一节应包括安全操作氧气系统时的必要信息，如容量和持续时间。

C. “环境系统”一节应包括安全操作氧气系统时的必要信息，如使用期间的系统能力。

A. 制造商可以建立程序，对在遵守时发现的不适航的状况提供反馈。

B. 制造商可以发布程序，对发现的各种不适航的状况提供建议。

C. 制造商可以建立程序，对发现的各种不安全状况提供技术支持。

A. Remove the 3 screws from the flap of the motor assembly.

B. Remove the 3 nuts from the flange of the motor assembly.

C. Remove the 3 screws from the flange of the motor assembly.

A. Immediately clean the area if one of the two compartments is affected by lead contamination.

B. If there is mercury pollution in the compartments, clean one of the two areas immediately.

C. If there is mercury contamination in one of the two compartments, clean the area immediately.

A. 系统的这一部分能够为飞机在地面上提供主要支撑，包括减震支柱、轮架轴、阻力杆、门、连杆、固定螺栓等。

B. 这部分系统为飞机在地面上提供主要支持，包括控制装置、管道、阻力支柱、门、连杆、上下门闩等。

C. 这部分系统为飞机在地面上提供主要支持，包括旋转密封套、管道、防滑装置、门、连杆、连接栓等。