單項選擇題

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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單項選擇題

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

單項選擇題

Lubricating oil used in a diesel engine serves to（）

A.reduce the wear of bearing surfaces
B.cool the bearing surfaces
C.assist in sealing bearing surfaces
D.all of the above