单项选择题

Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）

A.faulty combustion
B.excessive ring temperature
C.over lubrication
D.all of the above

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单项选择题

A.inlet nozzle ring
B.turbine wheel blade
C.diffuser passages
D.inlet vol

单项选择题

A.Excessive fuel
B.Higher than normal temperatures for star up
C.Longer starting periods
D.Higher than normal lube oil pressure

单项选择题

A.exhaust
B.air box pressure
C.brake main effective pressure
D.all of the above