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單項(xiàng)選擇題

A piston is said to be at top dead center when it is （）

A.opening the exhaust ports
B.placed on top of the engine along its centerline
C.farthest from the cylinder head
D.nearest to the cylinder head

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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

單項(xiàng)選擇題

A piston is at bottom dead center when it is（）

A.opening the exhaust ports
B.closing the fuel ports
C.farthest from the cylinder head
D.nearest to the cylinder head

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