单项选择题

A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.

A.fishing
B.in distress
C.at anchor
D.not under command

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单项选择题

A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.

A.distress position
B.spoken words "Mayday，Mayday，Mayday"
C.ship's name
D.ship's call letters

单项选择题

A person who sees someone fall overboard should（）.

A.immediately jump in the water to assist the individual
B.go to the bridge for the distress flares
C.run to the radio room to send an emergency message
D.call for help and keep the individual in sight

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.all is clear，it is safe to approach
D.a distress signal