- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
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
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