超星 - Unit 7 作业

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Communication satellites relay ( ) zuoy

A. voice
B. video
C. repeater
D. data signals

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The satellite must have ( )

A. a receiver
B. a receiver antenna
C. a transmitter and a transmit antenna
D. electrical power

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Modern communications satellites use a variety of orbits, including ( ).

A. geostationary orbits
B. Molniya orbits
C. elliptical orbits
D. low (Polar and non-polar) earth orbits

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Satellites communication has many advantages including ( ).

A. less costly for transmission over extremely long distances
B. a communication signal can be sent to any number of reception points simultaneously
C. extremely flexible
D. the sending and receiving points can be changed

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If the signal from the satellite is stronger, receiving station will be ( )

A. smaller
Bigger
C. more costly
D. less costly

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