单选题Which equipment is not a source of locating signals?（）AEPIRB's that transmit on 406 MHzBSurvival craft VHF transceivers that provide a beacon on 121.5 MHzCCOSPAS-SARSAT EPIRBsDSARTs operating on 9 GHz
单选题
Which equipment is not a source of locating signals?（）
A
EPIRB's that transmit on 406 MHz
B
Survival craft VHF transceivers that provide a beacon on 121.5 MHz
C
COSPAS-SARSAT EPIRBs
D
SARTs operating on 9 GHz
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