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
点击查看答案
相关考题
-
单项选择题
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 -
单项选择题
Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）
A.Impeller
B.Electric motor
C.Volute
D.Eye -
单项选择题
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
