A.prevent engine overheatingB.have proper air gasoline ……

单项选择题A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.

A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid

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.

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

单项选择题（）is not a process of weathering of the oil spilled in the sea water.

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

单项选择题（）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