单项选择题

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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（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.

A.Setting point
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A.account as
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