（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.

______ refers to the depth of a vessel below the waterline ， measured vertically to the lowest part of the hull ， propellers or other reference points ．

Which of the following is false?（） A: preparation for stand-by should be organized by engine room B: engine trails should be agreed with bridge, and then do it C: As to engine trials of the twin diesels and two propellers, the two diesels should use “slow ahead” at the same time D: After engine trials, the handle of the engine telegraph should be put in the “stop” positio

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 directio