单选题The existing terrestrial radio system has a number of basic flaws which（）.Acan be overcome by using traditional techniquesBcannot be overcome by satellite systemCcan be overcome by satellite and digital techniquesDcannot be tackled by any modern system
单选题
The existing terrestrial radio system has a number of basic flaws which（）.
A
can be overcome by using traditional techniques
B
cannot be overcome by satellite system
C
can be overcome by satellite and digital techniques
D
cannot be tackled by any modern system
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