单选题The first communication satellite was used for the purpose of（）.Ataking the place of the radio systemBintroducing a new life-saving systemCsaving the vessels in distressDimproving the communication on land
单选题
The first communication satellite was used for the purpose of（）.
A
taking the place of the radio system
B
introducing a new life-saving system
C
saving the vessels in distress
D
improving the communication on land
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