单项选择题

The ignition quality of a diesel fuel oil is indicated by the （）

A.specific gravity
B.cetane number
C.viscosity
D.calorific valve

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单项选择题

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

单项选择题

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

单项选择题

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

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