单项选择题

Which of the listed characteristics can be applied to R- 12 vapor?（）

A.It is corrosive
B.It is odorless
C.It is visible as h blue fog
D.It has a distinctive taste

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单项选择题

The percentage of impurities in a specific fuel oil sample is determined by （）.

A.settling in a fuel tank
B.testing in a laboratory centrifuge
C.burning in a calorimeter
D.testing in a closed cup

单项选择题

If your vessel bums 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?（）

A.1382 tons
B.1561 tons
C.1600 tons
D.1637 tons

单项选择题

Which of the following statements is correct concerning the “flash point ” of a liquid?（）

A.It is lower than the ignition temperature
B.It is the temperature at which a substance will spontaneously ignite
C.It is the temperature at which a substance, when ignited, will continue to bum
D.It is the temperature at which the released vapors will fall within the explosive range