In most operations there are key items that are significant to the job.

A. Spoilers are used to increase the drag of the aircraft in flight, or to interrupt lift during landing and during rejected take-off.

B. Spoilers are used to enhance aircraft resistance in flight or to disrupt boost during landing and when take-off is canceled.

C. Spoilers are used to increase the aircraft drag in flight, or destroy the lift during landing and in case of aborted take-off.

A. When describing the airplane＇s Engine, spark plug system shall be described.

B. When describing the airplane＇s Engine, starter system shall be described.

C. In the description of the airplane＇s Engine, ignition system shall be described.

A. Turn the drain valve counterclockwise to cause the fluid to stop flowing before the valve is pushed.

B. When you turn the drain valve counterclockwise, no fluid will flow until you push the valve in.

C. Make sure there is no fluid flowing after the valve is pushed, then turn the drain valve clockwise.

A. 接通液压时应确保手柄未接触止动点。

B. 液压释压时，确保手柄未触碰到止动点。

C. 使用液压时应确保控制手柄持续移动。

A. 除了适用的飞机模型或部件外，“适用性”声明还可能以注释形式包含特殊信息，如排除或添加。

B. 除了适用的飞机型号或部件外，“适用性”声明还可能包含特殊信息，如不适用或增加的内容，以注释的形式出现。

C. 除适用的飞机型号或部件外，“适用范围”部分还可以以“注”的形式给出特殊信息，如除外或增补信息等。

A. 本节中包含的异常应由手册编写者确定。

B. 手册的起草者可以将异常情况编入此章节。

C. 手册的生产商可以根据异常情况决定是否将其编入此章节。

A. Accumulate the thickness of the shim as follows: t=x-y.

B. Calculate the thickness of the shim as follows: t=x-y.

C. Calculate the width of the shim as follows: t=x-y.

A. 去除腐蚀以及表6001中提及的化学污染。

B. 用表6001中规定的化学剂去除腐蚀。

C. 清除表6001中提及的化学脱胶情况。

A. 盖子朝下的时候，是开关在开位的一种保护。

B. 封面在下面的时候，是开关在开位的保险。

C. 盖子朝下的时候，是开关在开位的保险。

A. Rapid operation of the accelerometer can cause unexpected movement of the vertical stabilizer.

B. Accidental movement of the compass can cause unwanted operation of the oriental stabilizer.

C. Sudden operation of the gyro can cause unwanted movement of the horizontal stabilizer.