相关题目
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 （ ） ．
If the aircraft in radio failure receives light signals provided by the controller during daytime, he should acknowledge tower transmission or light signals by （ ） ．
The controller can control the aircraft in one-way or two-way radio failure by using light signals. If this is the case, the pilot will look for （ ） for the clearance to land．
Generally, the aircraft holding time in the holding area should not exceed （ ）minutes.
