仪表进近图标题里“ILS/DME RWY17”表示:（）。

The cumulus stage of the thunderstorm is marked by （ ） ．

（ ） cloud is associated with fast-moving cold fronts.

（ ） generally produces the most violent flying weather.

（ ） is the most easily recognized discontinuity across a front.

The transition zone where two different airmasses meet is called a （ ） ．

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 （ ） ．