相关题目
When an aircraft is flying （ ）, we call it super low-altitude flying.
Uneven heating modifies air density and creates circulation patterns, resulting in changes in pressure. This is one of the main reasons for differences in （ ） between weather reporting stations.
A characteristic of the stratosphere is （ ） ．
The primary cause of all changes in the Earth’s weather is （ ） ．
The airway width in China is usually （ ） km, and due to some constraints can be reduced to, but not less than （ ） km.
The atmospheric circulation occurs through a process known as （ ）, which is defined as the circular motion that results when warm air rises and is replaced by cooler air.
The movement of the atmosphere set forth by the uneven heating of the earth’s surface is generally referred to as the atmospheric （ ）．
The major force that sets the atmosphere in motion comes from the （ ） of the earth＇s surface.
The flight altitude for aircraft with no oxygen equipment or whose oxygen equipment is unserviceable should not exceed （ ） meters.
The atmosphere is divided into layers according to the characteristics of each layer. The （ ） is the one closest to the earth.
