单项选择题
The intake ports of a two-strike/cycle diesel engine are opened and closed by the action of the （）
A.camshaft
B.piston movement
C.exhaust valves
D.vertical drive
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相关考题
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单项选择题
Valves in the cylinder head of a diesel engine are opened by the direct action of the（）
A.exhaust pressure
B.valve spring pressure
C.rocker arm movement
D.wrist pin movement -
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 -
单项选择题
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
