单项选择题
Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）
A.Improper fuel rack positioning
B.Lengthy opening of the exhaust valve
C.Excessively early injection timing
D.Extended light load operation
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After-cooling of a turbocharged diesel engine will result in （）
A.higher torque but lower brake horsepower
B.lower torque but higher brake horsepower
C.higher torque and lower brake horsepower
D.lower torque and higher brake horsepower -
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Lubricating oil used in a diesel engine serves to（）
A.reduce the wear of bearing surfaces
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Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）
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B.Critical speed
C.Maximum speed
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