When testing a Class A EPIRB you will know the EPIRB is work
题目
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（）.
B
the Morse Code signal for SOS
C
a computerized voice announcement of Mayday
D
your vessel's International Radio Call Sign
