题目内容
The range of primary radar is limited by terrain and detects ______ objects such as automobiles, hills and trees.
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Not all primary radar can ______ the altitude of an aircraft while secondary radar overcomes these limitations.
Secondary radar depends on a transponder to respond to interrogations from the ground station to make the aircraft more ______ .
Around busy airspace there is often a ______ requirement that all aircraft be equipped with a mode C or mode S transponders.
1.Mode S transponders are compatible with ______ the mode C signal.
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