The section of each end of a barge which is heavily reinforced to take the pressure of pushing is called the（）.

For existing ships，（）is not an improvement to safety.

The opening in the deck beneath the anchor windlass that leads to the chain locker is the（）.

When lowering manropes alongside a stage rigged over the side of a vessel，they should be allowed to trail in the water（）.

Why is it necessary to extend ventilators of gasoline powered vessels to the bilges（）.

Which term refers to a transverse curvature of the deck（）.

What type of stern tube bearing has the least friction（）.

What is used to prevent twisting of a towing bridle?（）

The permissible SWSF and SWBM are assigned by（）.

Floors aboard ship are（）.