单选题When testing a Class A EPIRB you will know the EPIRB is working properly if you hear on 99.5 Mhz FM or any vacant frequency on a nearby AM radio（）.Aa distinctive signalBthe Morse Code signal for SOSCa computerized voice announcement of MaydayDyour vessel's International Radio Call Sign
单选题
When testing a Class A EPIRB you will know the EPIRB is working properly if you hear on 99.5 Mhz FM or any vacant frequency on a nearby AM radio（）.
A
a distinctive signal
B
the Morse Code signal for SOS
C
a computerized voice announcement of Mayday
D
your vessel's International Radio Call Sign
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