单项选择题

Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?（）

A.Decreasing scavenge air pressure
B.Increasing exhaust temperatures before the turbine
C.Reduction in engine speed
D.All of the above

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单项选择题

A.quality of air filtration
B.effectiveness of lubrication
C.type of fuel used
D.all of the above

单项选择题

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

单项选择题

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