通常所说的黑匣子是指（）。

The radar summary chart is unique because it shows （ ） ．

（ ） are used for winds aloft forecasts.

A ceiling is defined as the height of the （ ） ．

（ ） is not included in a convective SIGMET.

When temperature rises, the takeoff weight and rolling distance will （ ） respectively.

SIGMETS are issued as a warning of weather conditions potentially hazardous （ ） ．

（ ） warn of weather hazards which mainly concern light aircraft.

When penetrating turbulent air, the pilot is expected to （ ） ．

Of the various aircraft icing, the one that has the greatest impact on flight is （ ）.

Wingtip vortices created by large aircraft tend to （ ） ．