單項(xiàng)選擇題

A.piston rod guides
B.engine thrust bearing
C.crosshead bearing
D.main shaft flexible coupling

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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

A.Intake stroke
B.Compression stroke
C.Exhaust stroke
D.Pumping stroke