相关题目
The （ ） measures, electronically, the time it takes for a signal, transmitted from an aircraft interrogator, to reach the ground base station transponder, and return.
The function of DME is to measure （ ） .
By measuring his radials from （ ） VOR station, a pilot can check his position.
VOR and DME operate on （ ） and as a consequence, are not affected by static or other interferences.
An aircraft can fly on automatically （ ） .
An alternate aerodrome is filed on a （ ） .
VHF is （ ） .
When aircraft depart at specified times, they are separated （ ） .
On a flight progress strip, a controller （ ） only current flight data.
Vertical separation is obtained by assigning different （ ） to aircraft, in other words, they are separated by a specified vertical distance.
