單項(xiàng)選擇題

What is the harmful effect of sulfur in a fuel?（）

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

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單項(xiàng)選擇題

The flash point of a liquid refers to the temperature （）

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

單項(xiàng)選擇題

The flash point of a petroleum product is an indication of its（）

A.viscosity
B.pour point
C.volatility
D.lower explosive limit