题目内容
词汇与结构Some countries have required that all aircraft ______ Mode S, even in uncontrolled airspace.
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词汇与结构Secondary Surveillance Radar is referred to as “secondary”, to ______ it from the “primary radar”.
词汇与结构Primary radar works by ______ bouncing a radio signal off the skin of the aircraft.
词汇与结构Primary radar works best with large all-metal aircraft, but not so well on small, ______ aircraft.
词汇与结构The range of primary radar is limited by terrain and detects ______ objects such as automobiles, hills and trees.
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