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單項(xiàng)選擇題

In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）

A.exhaust manifold
B.valve bridge
C.pressure of the fresh air charge
D.valve adjusting gear

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單項(xiàng)選擇題

If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be （）

A.excessive compression pressure
B.air in the fuel lines
C.high fuel pressure
D.excessive load

單項(xiàng)選擇題

One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）

A.reduce lube oil temperature
B.raise exhaust temperature reduce
C.excessive heating of engine room
D.reduce load on cooling water pump