单选题In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）Athe burning of the fuel； medium shaftBfuel spray； fresh airCfuel； fuel sprayDthe burning of the fuel； the burned gas mixture
单选题
In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）
A
the burning of the fuel； medium shaft
B
fuel spray； fresh air
C
fuel； fuel spray
D
the burning of the fuel； the burned gas mixture
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