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

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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
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