单选题Which spoken emergency signal would you use to call a boat to come assist a man overboard?（）ADistress signalBUrgency signalCSafety signalDNone of the above
单选题
Which spoken emergency signal would you use to call a boat to come assist a man overboard?（）
A
Distress signal
B
Urgency signal
C
Safety signal
D
None of the above
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