Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height? （）

To turn over a liferaft that is floating upside down，yo...

单项选择题To turn over a liferaft that is floating upside down，you should pull on the（）.

This illustration shows the correct method of securing ...

单项选择题This illustration shows the correct method of securing a（）.

The Vessel can be（）in lawful trades between ports，ancho...

单项选择题The Vessel can be（）in lawful trades between ports，anchorages or places where it is customary for similar size vessels to lie safely aground.