彩色气象雷达在接收强雷雨信号时显示（）。

The numbers 09 and 27 on a runway may indicate that the runway is oriented approximately （ ） ．

The runway number of a runway with a magnetic heading of 083° is （ ） ．

Which of the following statement is not true?

The number on the runway is given in relation to （ ）．

Industrial areas typically produce more fog since they （ ） ．

Hydroplaning is not likely to occur at high speeds on （ ） runways.

If frost is not removed from the wings before flight, it may cause （ ） ．

PIREPs are pilot reports of current （ ） ．

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

A jetstream is defined as wind of （ ） ．