The strake on each side of the keel is called a（）.

Bilge keels are fitted on ships to（）.

Prior to magnetic particle inspection of anchor chain，the chain should be（）.

The purpose of cant frames in steel vessels is（）.

Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.

Ship’s steering gear refers to（）.

Shell plating is（）.

Owing to the greater girth of a ship amidships than at the ends，certain strakes are dropped as they approach the bow and stern to reduce the amount of plating at the ends. These strakes are called（）.

In vessel construction，the garboard strake is（）.

Pollution regulations require that each scupper in an enclosed deck area have a（）.