单项选择题
A.Oil-lubricated bearings B.Lignum vitae C.Hard rubber D.Bronze bushings
What is a cofferdam（）.A.Tube fitted to an ullage holeB....
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
What can cause a lack of oxygen in a chain locker（）．A.A...
单项选择题What can cause a lack of oxygen in a chain locker（）．
A.Absorption B.Osmosis C.Evaporation D.Oxidation
Tonnage openings must be closed by means of（）.A.Press b...
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
