In a primary radar system:
A、theradarisprimarilyusedforrange-finding
B、allradiofrequencyenergyisproducedbytheradarlocatedattheradarsite
C、theaircraftplaysthesecondaryrole,justlisteningtotheradarsignalsfromthegroundradar
D、theradaristheprimaryaidforATC
发布时间：2025-05-22 17:58:58
