问题
单项选择题
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
答案
参考答案：B