相关题目
If the special flight fails to receive the weather information of concerned destination or alternate airport （ ） hours before takeoff, the weather station at the departure airport should voluntarily ask for it from relevant weather information unit.
For the special flights from abroad, VOLMET and TAF should be provided （ ） hours before special flights take off.
When the center of thunderstorm passes an area, the rule for the meteorological change in this area is falling temperature, （ ） , abrupt wing direction.
When we need to dispatch an aircraft to an airport to undertake a special flight mission, the aircraft-dispatching time is determined by （ ） .
By using （ ） a pilot knows he is on the correct course and he also knows his distance to the VOR/DME station.
When the aircraft is flying en-route, whether it is under the control of medium-and-low altitude control office or high altitude control office is dependent on the aircraft’s （ ） .
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.
