题目内容
At the airport, passengers need to get their boarding pass and checking in baggage at the ticket and luggage _____.
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People _____ in air traffic control may monitor aircraft movement in control tower.
_____ aircraft movement both in the air and on the ground is of great importance.
Aerial _____ is the process of transferring aviation fuel from one military aircraft (the tanker) to another (the receiver) during flight.
Maintenance and refueling _____ for aircraft are located near the runways.
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