问题
单项选择题
A Coast Guard radiotelephone message about an aid to navigation that is off station is preceded by the word（）.
A.PAN-PAN
B.MAYDAY
C.SOS
D.SECURITY
答案
参考答案：D
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A Coast Guard radiotelephone message about an aid to navigation that is off station is preceded by the word（）.
A.PAN-PAN
B.MAYDAY
C.SOS
D.SECURITY
参考答案：D