题目内容
1.Primary radar works by ______ bouncing a radio signal off the skin of the aircraft.
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1.Primary radar works best with large all-metal aircraft, but not so well on small, ______ aircraft.
The range of primary radar is limited by terrain and detects ______ objects such as automobiles, hills and trees.
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 ______ .
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