单项选择题

In ship construction，keel scantlings should be the greatest（）.

A.at each frame
B.amidships
C.one-third the distance from the bow
D.one-third the distance from the stern

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单项选择题

In ship construction，frame spacing is（）.

A.greater at the bow and stern
B.reduced at the bow and stern
C.uniform over the length of the vessel
D.uniform over the length of the vessel，with the exception of the machinery spaces，where it is reduced due to increased stresses

单项选择题

In relation to cargo gear，what does SWL mean?（）.

A.Safe working load
B.Ship's working lift
C.Starboard wing lift
D.Stress，weight，load

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In nautical terminology a dog is a（）.

A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge