Use an equivalent material if the specified one is not available.

A. 供给系统有这些用处。

B. 分散系统有这些功能。

C. 分配系统有这些功能。

A. 循环系统使用一个风扇使空气进入客舱支配总管。这个系统降低了空调组件的供气量。

B. 回流系统使用一个风扇使客舱空气进入混合总管。这个系统减少所需供气空调组件的数量。

C. 再循环系统使用一个风扇使客舱空气进入分配总管。这个系统减少空调组件所需供气量。

A. 如何解释处理潜在问题和紧急情况。

B. 解释如何识别潜在问题和处理紧急情况。

C. 可能的问题和紧急情况需要得到解释。

A. 为了获得正确的间隙，需要增加特殊的垫片。

B. 为了获得正确的间隙，按需增加特殊的垫片。

C. 要获得正确的间隙，需要增加特定的垫片。

A. 起落架是用来封闭起落架舱门的结构。如果门是作为一个整体结构，那么其内容可以仅在第32章中写出。

B. 起落架是门的结构，收起时被封闭在起落架舱内。如果门被做成一个完整结构，它们可以仅在第32章显示。

C. 起落架是门的结构，被用于装进起落架舱内。如果门是一个完整结构，它们可以仅在第32章展示。

A. 拆下附着在法兰到盖子上的四个螺钉。

B. 拆下四个螺钉，将法兰附着到盖子上。

C. 拆下将法兰固定到盖上的四个螺钉。

A. If the brackets are not damaged, continue the procedure.

B. In the absence of damage to the brackets, recall the process.

C. When bracket damage occurs, recall the procedure.

A. 确保座舱温度保持恒定。

B. 确保座舱压力保持不变。

C. 确保座舱湿度保持稳定。

A. Maintenance information needs to be continuously updated. The operator should communicate openly with the manufacturer about new situations, who should provide solid assistance to the operator. Only when both parties do their jobs can the entire fleet remain completely safe.

B. Maintenance information needs to be continually updated. Open communication should exist with the operator telling the manufacturer as soon as some new kind of situation arises and the manufacturer responding back with solid help to the operators. Only when both ends do their job can an entire fleet of airplanes remain continuously airworthy.

C. Maintenance information needs to be continuously updated. When a new situation arises, the operator should immediately communicate openly with the manufacturer, and the manufacturer should provide strong assistance to the operator. Only when both parties do their respective jobs can the entire fleet maintain airworthiness.

A. The file must be very easy to rewrite.

B. Every document must be simple to modify.

C. Document must be readily revisable.