1424、Identify the bell crank and shaft with marks to prevent incorrect installation。

56. When this occurs, 9th stage bleed air is automatically used.

55、遵守部件的拆卸程序。

54、Identify a revision to an illustration with a black vertical line in the left margin opposite the revised portionor use a "pointing hand".

53、lf the ＇meaning changes, use a different construction.

52、解释如何检查它们是否正常运行，以及如何识别故障

51、词典包括一些未经批准的词，如果能把这些词归在适用的技术名称类别中，它们可以是技术名称。

50、Revisions, additions and deletions shall be identified by a vertical black line along the outside of the pageopposite only that portion of the printed matter that was changed.

49、You can stow life vests in the space under the seats.

48、我们建议你不要在机库里执行此程序。

47、Use an equivalent material if the specified one is not available. 如果指定的材料不可用，请使用等效材料。