在下列图中，（）可以查找到起飞航径区内障碍物情况资料。

An altostratus cloud is classified in the （ ） cloud group.

Most clouds are composed of minute （ ） droplets.

When an airmass is warmed from below, its stability is （ ） ．

The tendency of an airmass to resist vertical motion is called （ ） ．

If an airmass forms over water, its classification is （ ） ．

（ ） results when the two airmasses are approximately equal in pressure.

（ ） is a weather phenomenon always associated with a thunderstorm.

Squall lines most often develop （ ） ．

In TAF, BR stands for （ ） .

（ ） are least likely to contribute to structural icing on an aircraft.