單項(xiàng)選擇題

If the compression ratio is increased on any diesel engine, （）

A.the expansion ratio will decrease
B.combustion will be slowed down
C.thermal efficiency will decrease
D.thermal efficiency will increase

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單項(xiàng)選擇題

If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）

A.changed
B.centrifuged
C.filtered
D.settled

單項(xiàng)選擇題

How are the pressure and temperature affected in a diesel engine cylinder during compression?（）

A.Pressure and temperature decrease
B.Pressure and temperature increase
C.Pressure decreases and temperature increases
D.Pressure increases and temperature decreases