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單項(xiàng)選擇題

Progressive flooding on a ship is controlled by securing watertight boundaries and（）.

A.transferring drill water
B.dumping bulk materials
C.pumping out flooded compartments
D.evacuating the unit

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單項(xiàng)選擇題

On a vessel，the keel is the primary strength member of the lower hull form in which direction?（）.

A.transverse
B.diagonal
C.longitudinal
D.vertical

單項(xiàng)選擇題

On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.

A.acrylic acid
B.benzene
C.oleum
D.vinyl toluene

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