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（）.
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.
