單項(xiàng)選擇題

Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）

A.Leaking seal ring
B.Insufficient heat transfer from the exhaust valves
C.Block cooling water passages to the head
D.Excessive scavenging air provided to the engine

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單項(xiàng)選擇題

The cetane rating of diesel fuel is an indication of the（）

A.ignition quality of the fuel
B.calorific value of the fuel
C.flash point of the fuel
D.rate of fuel consumption

單項(xiàng)選擇題

The cetane number of a diesel fuel oil indicates its（）

A.Viscosity
B.acid content
C.heating value
D.ignition quality