单项选择题

By regulation，cargo tank atmosphere must be inert before and during which operation?（）

A.Stripping
B.Loading
C.Cleaning
D.All of the above

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An oil tanker，except as provided for otherwise，might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.

A.she is not within a special area
B.she is within a special area
C.she has just departured from a special area
D.she is about to enter a special area

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An oil tanker operating with dedicated clean ballast tanks shall be equipped with（），approved by the Administration on the basis of specification recommended by the Organization，to enable supervision of the oil content in ballast water being discharged.

A.an oil content meter
B.an oil checker
C.an analyzer of oil content
D.a mixer of oily water

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Air gap is the vertical distance between the bottom of the hull and the（）.

A.still water level
B.wave crest
C.wave crest plus the charted water depth and tidal corrections
D.wave crest plus the charted water depth and tidal correction and storm surge