The upward slope of a ships bottom from the keel to the bilge is known as（）.

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

A.the descriptions
B.the measurements
C.the specifications
D.the prescriptions

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