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