单选题A radio determination system based on the comparison of reference signals with radio signals reflected,or retransmitted from the position to be determined,is（）.ADFBRadar SystemCDSC SystemDCOSPAS-SARSAT
单选题
A radio determination system based on the comparison of reference signals with radio signals reflected,or retransmitted from the position to be determined,is（）.
A
DF
B
Radar System
C
DSC System
D
COSPAS-SARSAT
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