单项选择题
Limit switches are used on which davits?（）
A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits
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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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In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.
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
