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A.It causes excessive smoking and soot at low firing rates
B.It doesn’t readily burn when combined with oxygen
C.It clogs fuel oil strainers more often
D.It forms a corrosive acid when mixed with water or water vapor

A.at which a liquid will give off inflammable vapors
B.at which a liquid will burn steadily
C.at which a liquid will explode
D.that a liquid must reach before it will flow readily