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单选题
Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）
A
High sulphur content fuel
B
High lube oil temperatures
C
High vanadium content fuel
D
Excessive piston slap
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Lube oil levelC
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单选题Which of the listed cylinder liner surface conditions indicates proper lubrication?（）A
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Bright appearanceC
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Excessive fuel injectionC
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Compression ratioB
Fuel/Air ratioC
Compression pressureD
Lube oil pressure
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Low lube oil temperatureB
Dirty lube oil strainerC
Low lube oil pressureD
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Octane number is alteredC
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单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）A
Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
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Vapor pockets formed in the suction flow streamB
Rough easing volute surfacesC
Worn wearing ringsD
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