單項選擇題A vessel，which does not normally engage in towing operations，is towing a vessel in distress. She（）.

A.need not show the lights for a vessel engaged in towing，if it is impractical to do so
B.may show the lights for a vessel not under command
C.must show a yellow light above the stern light
D.must show the lights for a vessel towing


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2.單項選擇題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

3.單項選擇題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

4.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
B.all is clear，it is safe to pass
C.all is clear，it is safe to approach
D.a distress signal

5.單項選擇題A distress signal（）.

A.consists of 5 or more short blasts of the fog signal apparatus
B.consists of the raising and lowering of a large white flag
C.may be used individually or in conjunction with other distress signals
D.is used to indicate doubt about another vessel's intentions