题目内容

A ______ is an electronic device that produces a response when it receives a radio-frequency interrogation.

A. transformer
B. transport
C. transponder
D. transporter

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Aircraft have transponders to assist in ______ them on radar and on other aircraft’s collision avoidance systems.

A. identifying
B. recognizing
C. realizing
D. distinguishing

1.Air traffic control units use the term “______” when they are assigning an aircraft a transponder code.

A. identify
B. ident
C. squawk
D. allocate

1.Depending the type of ______ , the transponder sends back a transponder code to help air traffic controllers to identity the aircraft.

A. communication
B. discussion
C. consultation
D. interrogation

1.Mode S is ______ in controlled airspace in many countries.

A. possible
B. mandatory
C. indispensable
D. necessary