单项选择题
What can cause a lack of oxygen in a chain locker（）．
A.Absorption
B.Osmosis
C.Evaporation
D.Oxidation
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Tonnage openings must be closed by means of（）.
A.Press board
B.Steel hatch boards
C.Steel plates
D.Wooden hatch boards -
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The Vessel’s cargo holds are properly fitted with（）in way of hatches.
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The strake on each side of the keel is called a（）.
A.Sheer strake
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