單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題Sludge may form in the crankcase of an air conditioning compressor as a result of ().

A.bubbling refrigerant
B.overheating and oxidation
C.lowered operating temperatures
D.reducing the cloud or flash point