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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单项选择题

Tonnage openings must be closed by means of（）.

A.Press board
B.Steel hatch boards
C.Steel plates
D.Wooden hatch boards

单项选择题

The Vessel’s cargo holds are properly fitted with（）in way of hatches.

A.Floor-ceiling
B.Battens
C.Covers
D.Hard-wood boards

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