相关题目
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．
Which of the following statement is not true?
Which of the following is not true as concerns airport surveillance radar (ASR)?
A clearance to taxi to the active runway means a pilot has been given permission to taxi （ ） ．
To identify an aircraft by turning before providing radar service, the turning angle should be greater than （ ）.
Which of the following is not a usual method to establish the radar identification?
When the controller wants to ensure the validity of the Mode C altitude readout, he may say “（ ） at 7,500”.
