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
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 （）.
单项选择题 A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
