相关题目
With too much clutter, a controller （ ） see the aircraft.
The accommodation and reception of the flight crew undertaking the special flight is the responsibility of （ ） . The local airport or aeronautical station may also have authorization to fulfill this task.
Based on the circumstances of a special flight, the airlines can send （ ） to fly with the crew to handle such work as flight navigation, delivery and coordination.
When the word radar is used alone, it usually includes （ ） .
When special flight is in operation, （ ） should have its flight status in hand and monitor it all through the flight.
At night or during poor visibility by day, lights are （ ） . For lights to be effective, they must be of adequate intensity.
At night （ ） are used by a marshaller.
Flight altitudes in the holding area: from 600m upward, there is a flight altitude for every 300m. The true height between the lowest holding altitude and the highest obstacle should not be less than （ ） m, the true height between the lowest holding altitude and the initial altitude in an instrument approach should not be less than （ ） m.
（ ） VASIS, combined with ILS, the pilot can bring an aircraft down safely almost to touchdown by day or night.
The Visual Approach Slope Indicator System, better known as VASIS, is a beam of light having a （ ） color in its upper part and a （ ） color in its lower part.
