单项选择题
Progressive flooding is controlled by securing watertight boundaries and（）.
A.transferring water ballast B.jettisoning cargo C.pumping out flooded compartments D.abandoning ship
单项选择题 Please tell the stevedores to load the cargo（）according to the respective figures.
单项选择题 Placing a lashing across a hook to prevent a fitting from slipping out of the hook is called （）.
单项选择题 Peck and Hale gear is used most commonly for securing（）.
