单项选择题
If the temperature drops low enough, oil will not flow, （） just tell us the temperature.
A.Hash point B.Viscosity C.Pour point D.Cetane number
单项选择题 The （） can tell us how much heat we can get from the burning of an oil.
单项选择题 （） into the cylinder because no fuel can burn （） it.
单项选择题 When the fuel oil is burning in the combustion chamber, it （）.
