A radio determination system based on the comparison of reference signals with radio signals reflected,or retransmitted from the position to be determined,is（）.<br>A:DF<br>B:Radar System<br>C:DSC System<br>D:COSPAS-SARSAT

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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