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在发动机燃烧过程的研究中,波尔舍公司研究了四气门的燃烧室。有两个进气门和两个排气门的汽油机,是人们早已熟知的结构型式,这似乎只是为
In a study of the engine combustion process, Porsche studied the four-valve combustion chamber. A gasoline engine with two intake valves and two exhaust valves is a well-known type of structure that seems to be just