单项选择题
Roll-on／roll-off ships are equipped with（）.
A.cargo elevators B.conveyor belts C.ramps D.derricks and winches for cargo handling
单项选择题 Precautionary measures must be taken to（）safety of the stevedores，cargo and the ship.
单项选择题 Please stow the drums（）ends.
单项选择题 Please choke up the drums to prevent（）.
