更多"The Chinese satellite is______."的相关试题:
[单项选择]
The Chinese satellite is supposed to return to the earth______.
A. within 16 months
B. soon
C. in 6 months’ time
D. on Thursday
[单项选择]Satellite Ⅳ
Today, you see compact satellite dishes perched on rooftops all over the United States. Drive through rural areas beyond the reach of the cable companies and you’ll find dishes on just about every house. The major satellite television companies are bringing in more customers every day with the lure of movies, sporting events and news from around the world.
The Broadcast TV Problem
Conceptually, satellite television is, a lot like broadcast television. It’s a wireless system for delivering television programming directly to a viewer’s house. Both broadcast television and satellite stations transmit programming via a radio signal. Broadcast stations use a powerful antenna to transmit radio waves to the surrounding area. Viewers can pick up the signal with a much smaller antenna.
The main limitation of broadcast television is range. The radio signals used to broadcast television shoot out from the broadcast antenna in a straight line.
A. between 3.4 GHz and 7 GHz
B. between 12 GHz and 14 GHz
C. between 14 GHz and 21 GHz
D. between 21 GHz and 27GHz
