单项选择题

On a large diesel engine installation, crankshaft axial alignment is maintained by the （）

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

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单项选择题

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

单项选择题

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

单项选择题

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