单项选择题
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve
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A.swivel
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C.drawworks
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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 -
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
