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單項(xiàng)選擇題

In diesel engineering practice, the term used to express the ignition quality of a particular fuel is（）

A.cetane number
B.octane number
C.ignition index number
D.volatility point

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單項(xiàng)選擇題

The cetane number rates fuels for diesel engines according to its （）

A.antiknock characteristics
B.ignition qualities
C.rates of vaporization
D.viscosity

單項(xiàng)選擇題

Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）

A.increase in starting air pressure
B.increase in lube oil viscosity
C.compression expansion device
D.jacket water heater