All flow control devices within the system, such as check valves, fuel pumps, accumulators, and relays should be included and indicated. Solenoid valves shall be indicated as such and shall include a notation indicating whether the valve is spring-loaded to the open or closed position. Once a symbol or device is established for a valve or control, it shall be used for this type of unit throughout the manual. The symbols used should be shown and identified in a legend block on the schematic diagram.

A. 常规的程序检查单应简明扼要，旨在提醒飞行员检查事项，而不提供任何系统的操作细节。

B. 常规的程序检查单应准确，目的是提醒飞行员检查关于缩略语及其涉及的事项，不提供任何系统操作细节。

C. 常规的程序检查单应明确目的，旨在提醒飞行员关于检查的事项，提供包括缩略和涉及的细节。

A. 不要拧紧螺母去压紧它。

B. 不要旋转螺母去校准它。

C. 不要拧松螺母去对准它。

A. Each manufacturer is expected to reasonably abide by the Specification content and arrangement.

B. Each manufacturer is expected to reasonably agree with the Specification content and arrangement.

C. Each manufacturer is expected to reasonably substitute the Specification content and arrangement.

A. Grab a plier to release the clips.

B. Grab a screwdriver to release the bolts.

C. Grab a screwdriver to release the clips.

A. When you change a word, always assure that the alternative you choose does not change the sequence of the sentence.

B. When you replace a word, always make sure that the alternative you select does not change the meaning of the sentence.

C. When you exchange a word, always ensure that the alternative you pick does not change the order of the sentence.

A. Information on specific optional systems or equipment may be included in this section or in Section 9, Supplementary.

B. Information about noncompulsory systems or equipment may be included in this section or in Section 9, Supplements.

C. Information on specific optional systems or equipment may be included in this Section or in Section 9, Supplements.

A. Each door has flexible seals at its structure interface which protect the metal interfaces from damage by the airflow.

B. Each door has flexible seals at its structure interface which protect the metal interfaces from no damage by the airflow.

C. Each door has formalist seals at its structure interface which protect the metal interfaces from damage by the airflow.

A. Section 1 of the Pilot＇s Operating Handbook shall introduce basic data and information of general interest to the pilot. The data and information is useful in loading, sheltering, handling, and routine preflight checking of the airplane.

B. Section 1 of the Pilot＇s Operating Handbook shall present basic data and information of general interest to the pilot. The general interest is useful in loading, sheltering, handling, and routine preflight checking of the airplane.

C. Section 1 of the Pilot＇s Operating Handbook shall present basic data and information of general interest to the pilot. The pilot is useful in loading, sheltering, handling, and routine preflight checking of the airplane.

A. 真空子系统是指用于产生、输送和调节高于大气压的空气的装置和部件，包括泵、调节器、管线等，该子系统还包括歧管。

B. 真空子系统是指用于产生、输送和调节低于大气压的空气的装置和部件，包括泵、调节器、管线等，但该子系统并不通过和包括歧管。

C. 真空子系统是指用于产生、输送和调节低于大气压的空气的组件和部件，包括泵、调节器、管线等以及总管和流经总管的部件。

A. 最大起落架放下速度是指起落架放下状态下飞机可以安全飞行的最大速度。

B. 最大起落架收放速度是指起落架收放过程中飞机可以安全飞行的最大速度。

C. 最大起落架收上速度是飞机可以安全飞行的最大速度，起落架收上。