Illustrations should be used whenever they will simplify, shorten or make the text easier to understand.

A.注释应该在简化、缩短文章或使文章更易于理解时被使用。

B.只要可以简化、缩短文本或使文本更易于理解，都应使用插图。

C.缩略语应该用在所有需要简化、缩短文章或使文章易于理解的时候。

正确答案：B

Maximum Landing Gear Extended Speed is the maximum speed at which an aircraft can be safely flown with the landing gear extended.

Point the open end of the drain hose away from the structure.

If you use solvent in a closed space, make sure that there is good airflow in the work area.

During night operation, make sure that the panel lights are dim.

Do a test to find if the management unit transmits the data.

The related caution light must go off after 30 seconds.

Examine the opening for cracks that start at its corners.

Make sure that there is continuous movement of the probe.

Remove the sensor to get access to the adjacent structure.

Operate the dimmer switch and make sure that the intensity of the light changes.