相关题目
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.
If the pilot believes that his radio has failed, what is the proper procedure he will use to inform the controller of the situation?
The （ ） situation is a condition of being threatened by serious and/or imminent danger and of requiring immediate assistance.
Code （ ） is used after the failure of two-way radio communications．
