单项选择题

It is generally NOT allowed to clean up an oil spill by using（）.

A.a boom
B.suction equipment
C.chemical agents
D.skimmers

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If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked，when is it required to be hauled out again? （）

A.12 months since last dry-docking
B.18 months since last dry-docking
C.24 months since last dry-docking
D.36 months since last dry-docking

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If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）

A.Replace the batteries
B.Check the sampling tube for blockage
C.Adjust the final reading by the amount the needle is displaced from zero
D.Replace the platinum filament

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If dangerous goods have been thrown overboard by the Shipowner or the master，（）can be made liable for their loss.

A.either
B.the master
C.the Shipowner
D.neither