相关题目
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.
For the arriving A/C whose engines partially fail, the controller should （ ） .
The difference between the temperature and the dew point is called the （ ） .
If the special flight fails to receive the weather information of concerned destination or alternate airport （ ） hours before takeoff, the weather station at the departure airport should voluntarily ask for it from relevant weather information unit.
For the special flights from abroad, VOLMET and TAF should be provided （ ） hours before special flights take off.
When the center of thunderstorm passes an area, the rule for the meteorological change in this area is falling temperature, （ ） , abrupt wing direction.
