单项选择题
A.camshaft B.piston movement C.exhaust valves D.vertical drive
Valves in the cylinder head of a diesel engine are open...
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
On a large diesel engine installation, crankshaft axial...
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
A piston is said to be at top dead center when it is （）...
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
