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

单项选择题A sweep oar is an oar that is（）.

A.generally shorter than the others and is used to steer with
B.is longer than the others and is used as the stroke oar
C.is raised in the bow of the boat for the steersman to steer by
D.longer than the others used for steering

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

单项选择题A flooded lifeboat on board a vessel would adversely affect the vessel’s stability by（）.

A.increasing the righting moment
B.decreasing the vessel's displacement
C.increasing the reserve buoyancy
D.shifting the CG（center of gravity）off center

单项选择题A crew member has just fallen overboard off your port side．Which action should you take （）.

A.immediately put the rudder over hard right
B.immediately put the rudder over hard left
C.immediately put the engines astern
D.wait until the stern is well clear of the man and then put the rudder over hard right