The Tonnage Certificate gives（）of a vessel which is classified into gross tonnage and net tonnage.

单项选择题The term PINTLE AND GUDGEON are associated with the（）.

A.anchor windlass
B.jumbo boom
C.rudder
D.steering engine

单项选择题The sprocket wheel in a windlass，used for heaving in the anchor，is called a（）.

A.capstan
B.dog wheel
C.fairlead
D.wildcat

单项选择题The sprocket teeth on a wildcat are known as the（）.

A.pawls
B.devil's claws
C.whelps
D.pockets

单项选择题The ratio of the height of a vessel’s rudder to its width is referred to as the（）.

A.aspect ratio
B.constriction ratio
C.rudder ratio
D.steering ratio

单项选择题The projecting lugs of the rudderpost which furnish support to the rudder are called（）.

A.bases
B.gudgeons
C.pintles
D.rudder lugs