单项选择题
A.Distress B.Safety C.All clear D.Urgency
Is extra power available（）emergency while maneuvering?A...
单项选择题Is extra power available（）emergency while maneuvering?
A.for B.in C.during D.to
A man aboard a vessel，signaling by raising and lowering...
单项选择题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
You are（）danger.A.run inB.running intoC.run intoD.runni...
单项选择题You are（）danger.
A.run in B.running into C.run into D.running in
