单项选择题
The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.
A.low viscosity index
B.high viscosity index
C.high neutralization number
D.low demulsibility quality
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Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A.Loss of suction
B.Increased clearances
C.Decreased clearance
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The dew point of air is reached when the wet bulb temperature is （）.
A.Twice the dry bulb temperature
B.10℃ above the dry bulb temperature
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Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）
A.Production of high salinity distillate
B.Seawater feed temperature below 165℃
C.A leak in the first stage demister
D.A cracked distillate pump vent line
