题目内容
1.Depending the type of ______ , the transponder sends back a transponder code to help air traffic controllers to identity the aircraft.
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1.Mode S is ______ in controlled airspace in many countries.
1.Some countries have required that all aircraft ______ Mode S, even in uncontrolled airspace.
1.Secondary Surveillance Radar is referred to as “secondary”, to ______ it from the “primary radar”.
1.Primary radar works by ______ bouncing a radio signal off the skin of the aircraft.
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