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單項(xiàng)選擇題

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

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

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