题目内容

Not all primary radar can ______ the altitude of an aircraft while secondary radar overcomes these limitations.

A. calculate
B. estimate
C. accumulate
D. stimulate

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Secondary radar depends on a transponder to respond to interrogations from the ground station to make the aircraft more ______ .

A. visible
B. invisible
C. clear
D. unclear

Around busy airspace there is often a ______ requirement that all aircraft be equipped with a mode C or mode S transponders.

A. regulate
B. regulation
C. regular
D. regulatory

1.Mode S transponders are compatible with ______ the mode C signal.

A. transmitting
B. transiting
C. transporting
D. transacting

1.Without the pressure altitude reporting, the air traffic controller has no display of ______ altitude information.

A. acute
B. special
C. accurate
D. specific