相关题目
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（ ）.
The （ ） situation is a condition of being concerned about safety and of requiring timely, but not immediate, assistance.
Code 7700 is used for （ ） ．
One of the ways the pilot can be identified easily on radar when in distress is （ ） ．
