單項選擇題PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow?().

A.Distress
B.Safety
C.All clear
D.Urgency


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A.for
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2.單項選擇題A man aboard a vessel,signaling by raising and lowering his outstretched arms to each side,is indicating().

A.danger,stay away
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C.the vessel is anchored
D.a distress signal

3.單項選擇題You are()danger.

A.run in
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C.run into
D.running in