单项选择题

A flame screen（）.

A.permits the passage of vapor but not of flame
B.prevents the passage of flammable vapors
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank

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（）shall be provided in every cargo tank and slop tank in accordance with the appropriate Resolutions.

A.A load on top system
B.Direct line system
C.Circle line system
D.An inert gas system

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（）is not a process of weathering of the oil spilled in the sea water.

A.Evaporation
B.Dispersion
C.Emulsification
D.Drifting

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（）is not a process of weathering of the oil spilled in the sea water.

A.Emulsification
B.Sedimentation / Sinking
C.Oxidation including photooxidation
D.Burning organized by RCC