相关题目
The control unit established to provide Air Traffic Control Service to controlled flights arriving at, or departing from, one or more aerodromes, is （ ）.
When an aircraft station fails to establish contact with the aeronautical station on the designated frequency, it shall （ ） ．
The controller may direct the pilot of the aircraft in distress to “squawk Mayday”. If this is the case, the pilot should （ ） ．
Urgency messages have （ ） over all transmissions except distress messages.
The category symbol for flight forecast is （ ）.
The word “Panpan”, spoken at the start of a transmission indentifies （ ） ．
The word “Mayday” spoken at the start of a transmission identifies （ ） ．
The ELT, an electronic, battery-operated transmitter, sends forth a distinctive （ ） on 121.5 MHz.
At night the aircraft in radio failure can acknowledge tower transmission or light signals by （ ） to indicate that the pilot understands the light signals and will comply accordingly.
The priority indicator for FPL is（ ）.
