单选题In describing basic diesel engine operation，the term ‘event’ refers to （）Athe production of high pressure gasesBthe removal of expended combustion gasesCthe admission of air to the cylinderDall of the above
单选题
In describing basic diesel engine operation，the term ‘event’ refers to （）
A
the production of high pressure gases
B
the removal of expended combustion gases
C
the admission of air to the cylinder
D
all of the above
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