Seasickness is caused by rolling or rocking motions which affect fluids in the（）.

单项选择题Releasing oil from the sea anchor of a lifeboat may（）.

A.keep the propeller from being fouled
B.increase propeller speed
C.help calm the waves in the vicinity of the craft
D.increase the holding power of the sea anchor

单项选择题On a vessel，if someone fell overboard and you did not know over which side the person fell，you should（）.

A.immediately reverse the engines
B.stop the propellers from turning and throw a ring buoy over the side
C.increase speed to full to get the vessel away from the person
D.first put the rudder hard over in either direction

单项选择题On a ship，a fire pump may be used for other purposes if（）.

A.the other services are run off a reducing station with a pressure gage
B.a separate fire pump is available for use on the fire main
C.all other services are operated by a manifold near the pump
D.All of the above

单项选择题On a rigid liferaft which is equipped with all of the required equipment you may NOT find a（）.

A.boathook
B.fishing kit
C.lifeline or grab rail
D.sea painter

单项选择题Oil fires are best extinguished by（）.

A.cutting off the supply of oxygen
B.removing the fuel
C.cooling below the ignition temperature
D.spraying with water