单项选择题
A.low viscosity index
B.high viscosity index
C.high neutralization number
D.low demulsibility quality
单项选择题 Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
单项选择题 The dew point of air is reached when the wet bulb temperature is （）.
单项选择题 Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）