VOR和DME合装时，二者频率（）。

SSR Code A7700 means （ ） .

The width of airway is （ ） km, and due to some constraints, should not be less than （ ）km.

The flight forecast information compiled by ARO should be promulgated not later than （ ） hours on the day before the flight.

The separations of aircraft include vertical, lateral and （ ） separations.

Moderate icing means the depth of icing is （ ） mm per minute.

The typical ATIS may include （ ） .

The ATIS information is normally updated every （ ） .

The ATIS informs （ ） pilots of weather condition and other pertinent information at the airport.

“Active runway” means “Runway currently in （ ）”.

The pilot-in-command shall （ ） a flight plan to the relevant ATC unit at least one hour before the estimated time of departure.