在TCAS告警过程中，航空器驾驶员或管制员应当（）。

The communication frequency for VOR is between （ ） .

Area navigation system has （ ） operational capabilities.

The farthest distance the weather radar can detect is （ ） miles.

At the landing phase, to avoid the wake turbulence of preceding aircraft, the succeeding aircraft should （ ） .

The numbering of domestic regional air lines falls into two categories: （ ） used between the flight control regions, and （ ） used within the flight control regions.

（ ） can be started up when flying in the air.

Overloading refers to （ ） .

Code （ ） is available for provisional use by relevant control units.

SAS991, are you （ ） for immediate departure?

CTL：JAL175, （ ）.