问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A