【填空题】Complete the following short sentences by filling the blanks with the words or phrases given in the bracket chart, neglect, Alerting, range, distress initiates, uncertainty, ramps, activated, notify, negative 1. In controlled airspace, ________ service should be provided when the position of the aircraft is in doubt. 2. At _______ phase, the actual search mission is launched. 3. Upon issuing an ALNOT, first, the controller should plot the flight of the aircraft involved on a _________. It is crucial to determine the possible future position of the aircraft and its maximum ________ of action from the last known position. 4. At alert phase, the destination airport checks all ________ and hangers to locate the aircraft. 5. At alert phase, finally the ATS unit which________the alerting notice should announce the termination of the state of emergency. 6. Because of the high rate of false alarms, _________ phase is designed to determine if an aircraft is really missing or if a crew _________ to close their flight plan. If the PRECOM comes up________, then the next phase is ________. 7. In general, the ATS units shall __________ units providing alerting service in other affected FIRs or control areas of the emergency phase.