单项选择题
The cetane number rates fuels for diesel engines according to its （）
A.antiknock characteristics
B.ignition qualities
C.rates of vaporization
D.viscosity
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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 -
单项选择题
The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
A.corrosion and grooving of exhaust valves
B.corrosion and gumming of the fuel injection pump
C.salt deposits in the exhaust manifold
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单项选择题
The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）
A.clogged fuel injection pumps
B.increased cylinder liner wear
C.intake valve stem corrosion
D.varnish deposit on pistons
