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單項選擇題

High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）

A.improper fuel rack positing
B.lengthy exhaust valve duration
C.extend operation at light load
D.excessively early injection timing

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單項選擇題

One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）

A.crankcase
B.cylinder head
C.valve cover
D.engine frame

單項選擇題

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

A.Impeller
B.Compressor
C.After-cooler
D.Exhaust differ

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