水平状态指示器是一个多参数的综合指示器，它主要由（）。

PIREPs are pilot reports of current （ ） ．

The strength and location of the jet stream is normally （ ） ．

A jetstream is defined as wind of （ ） ．

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.