单项选择题
Cylinder oil is a high viscosity mineral oil, with a （） machined to the anticipated sulfur content of the fuel.
A.TAN
B.TBN
C.SAN
D.SBN
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Out of the many hazards that can occur on ships, fire is by far the most frequent, and（） more total losses than any other casualty.
A.due to
B.owing to
C.results from
D.results in -
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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
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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
B.Dew point
C.Flash point
D.Lean point
