Politically correct English refers to the act of changing a word or expression instead of another in order to avoid being offensive. This can apply to situations such as sexism or racism. An example of this would be to use the term "Firefighter" instead of "fireman"
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Usually at the end of your school year or the beginning of your next school year
Refinery gases, Gasoline, Naphtha, Kerosene, Diesel Oil, Fuel Oil, Bitumen, Paraffin wax, Heating Oil, Jet Fuel.