问题
单项选择题
The transmission of a（）indicates that a ship is in distress and requires immediate assistance.
A.urgent traffic
B.distress alert
C.routine traffic
D.NAVTEX message
答案
参考答案：B
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The transmission of a（）indicates that a ship is in distress and requires immediate assistance.
A.urgent traffic
B.distress alert
C.routine traffic
D.NAVTEX message
参考答案：B