单项选择题

What is a cofferdam（）.

A.Tube fitted to an ullage hole
B.Area the product is loaded into
C.Void or empty space separating two tanks
D.Opening in the deck used for cleaning a tank

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单项选择题

What can cause a lack of oxygen in a chain locker（）．

A.Absorption
B.Osmosis
C.Evaporation
D.Oxidation

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