管制员需要观察频点是否处于长接收或长发射状态，判断是否为管制员话筒卡阻或航空器驾驶员话筒卡阻
符合下列条件之一，可视为恢复正常运行：( )
当收到航空器驾驶员报告GPS失效时，应确认是( )。
公共突发事件发生时，管制员应当：（ ）
The _______ situation is a condition of being threatened by serious and/or imminent danger and of requiring immediate assistance.
If the pilot believes that his radio has failed, what is the proper procedure he will use to inform the controller of the situation?
If the aircraft in radio failure receives light signals provided by the controller during daytime, he should acknowledge tower transmission or light signals by ．
One of the ways the pilot can be identified easily on radar when in distress is ．
The _______ situation is a condition of being concerned about safety and of requiring timely, but not immediate, assistance.
The ELT, an electronic, battery-operated transmitter, sends forth a distinctive _______ on 121.5 MHz.
The word “Mayday” spoken at the start of a transmission identifies ．
The word “Panpan”, spoken at the start of a transmission indentifies ．
Urgency messages have _______ over all transmissions except distress messages.
The controller may direct the pilot of the aircraft in distress to “squawk Mayday”. If this is the case, the pilot should _______ ．
The controller will issue instructions using the phrase “_______” in cases where the Mode C altitude readout differs significantly from the altitude reported by the pilot.
