單項(xiàng)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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Is extra power available（）emergency while maneuvering?

A.for
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單項(xiàng)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
B.all is clear，it is safe to pass
C.the vessel is anchored
D.a distress signal