During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）<br>A:Intake stroke<br>B:Compression stroke<br>C:Exhaust stroke<br>D:Pumping stroke

During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）
A:Intake stroke
B:Compression stroke
C:Exhaust stroke
D:Pumping stroke

出自：海船船员证

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