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
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 （）.
单项选择题 After the ship is out of the harbour and in “Full Speed”, well change （）.
