相关题目
When an ATC unit changes the type of call sign of an aircraft, that unit shall ensure （ ） the call sign indicated by the flight plan when the aircraft is transferred to another ATC unit.
To avoid confusion, the ATC unit should, if appropriate, identify the aircraft which will（ ） to change its call sign by referring to its position and/or level.
The main feature of next generation navigation system is （ ） .
Which following elements of information shall the position reports contain? a. aircraft identification, b. position, c. time, d. flight level or altitude, e. next position and time over, f. ensuing significant point.
The prescribed standard turn slope in a holding procedure is （ ） degrees.
The spread of long wave and medium wave is mainly in the form of （ ） .
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 （ ） .
