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單項(xiàng)選擇題

The sprocket teeth on a wildcat are known as the（）.

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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