In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.<br>A:MF/HF<br>B:SART<br>C:EPIRB<br>D:any of A, B, C

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
A:MF/HF
B:SART
C:EPIRB
D:any of A, B, C

出自：海船船员证

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