相关题目
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.
The approximate percentage of the oxygen content of the atmosphere is （ ） ．
The atmosphere contains approximately 78% of （ ） ．
Priority indicator QD in SITA represents（ ）.
Aerodrome information should not be passed to aircraft （ ） ．
