Which lashing device（s）would be used in securing heavy vehicles aboard Ro-Ro vessels ________．

You intend to tow a barge with one tug and expect continuous high winds from the north．To reduce the yaw of your tow，you should ______．

Your tow contains a barge carrying carbon tetrachloride．What is NOT required ________．

You are operating a lift boat．When jacking down and a leg becomes stuck on the bottom，you should ______．

You are testing a tank that contained gasoline by using a combustible gas indicator．Under testing，the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero．What is the concentration of flammable gas ________．

You are loading a cargo of bagged coffee beans．To keep cargo leakage from being contaminated by the ship's structure，you should ______．

You are in a tank wearing the self-contained breathing apparatus and you desire to return topside．How many tugs of the lifeline mean to take up the slack ________．

Which statement about entering into a tank which has been sealed for a long time is TRUE ________．

Which organization would conduct a survey of the insulation in a reefer compartment prior to loading cargo ________．

Which operating procedure（s）should be adhered to on a Ro-Ro vessel ________．

Which lashing device（s）would be used in securing heavy vehicles aboard Ro-Ro vessels ________．