单项选择题
A.is made to circulate out of the system B.is made to circulate within the system C.is made circulate within the system D.is made circulate out of the system
If the temperature drops low enough, oil will not flow,...
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
The （） can tell us how much heat we can get from the bu...
单项选择题The （） can tell us how much heat we can get from the burning of an oil.
A.viscosity B.flash point C.cetane number D.calorific value
（） into the cylinder because no fuel can burn （） it.A.A...
单项选择题（） into the cylinder because no fuel can burn （） it.
A.Air must be admitted；without B.Oil must be injected；without C.Air must be admitted；with D.Oil must be injected；with
