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
单项选择题 （）shall be provided in every cargo tank and slop tank in accordance with the appropriate Resolutions.
单项选择题 （）is not a process of weathering of the oil spilled in the sea water.
