單項(xiàng)選擇題When considering the lowest fuel system operating temperature, （） are important.
A.specific gravity or relative density
B.open flash point and closed flash point values
C.higher calorific and lower calorific values
D.cloud point and pour point values
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1.單項(xiàng)選擇題（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.
A.Setting point
B.Dew point
C.Flash point
D.Lean point
2.單項(xiàng)選擇題A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.
A.purifies
B.combinations
C.concentrations
D.filters
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