题目内容
For a major airport, where the ground conditions permit, the most satisfactory type of _____ for long-term minimum maintenance is concrete.
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Runway pavement surface is prepared and maintained to maximize _____for wheel braking.
One of the purposes of ATC system is to _____ the flow of traffic.
The standard procedures of exchanging the flight controls are highly _____.
An airplane is usually suggested to fly a regular traffic pattern to more safely _____ with other aircraft.
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