下列有关最小超障余度的说法正确的是（）。

An elongated area of low pressure with the lowest pressure along a line is called a （ ） ．

Air tends to flow from a （ ） pressure area to a （ ） pressure.

The low pressure area at the equator is caused by the （ ） ．

The conditions that will result in the formation of frost are （ ） ．

Routine aviation weather report is （ ） .

Drizzle, rain, snow, hail, ice pellets, and ice crystals are all forms of （ ） ．

The presence of ice pellets at the surface is evidence that （ ） ．

Every physical process of weather is accompanied by or is the result of a （ ） ．

Water vapor is removed from the atmosphere by the process of （ ） ．

Water vapor is added to the atmosphere by the process of （ ） ．