單項(xiàng)選擇題A well-lubricated bearing surface always appears（）

A.well knurled
B.slightly streaked
C.lightly glazed
D.highly polished


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1.單項(xiàng)選擇題If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）

A.only the replacement of the entire pump would be acceptable
B.the injection pump and injection nozzle must be replaced
C.either the barrel or plunger must be replaced
D.the barrel and plunger must be replaced as a unit

2.單項(xiàng)選擇題In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）

A.bedplate or base
B.sump or oil pan
C.cylinder block
D.frame

3.單項(xiàng)選擇題Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）

A.water in the fuel
B.insufficient fuel for combustion
C.clogged air intake passages
D.burning lubricating oil

4.單項(xiàng)選擇題Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）

A.increased horsepower
B.reduced efficiency
C.increased heat loss
D.lower cylinder pressures

5.單項(xiàng)選擇題An emergency diesel generator should automatically shut down in the event of （）

A.dangerous over-speeding
B.a loss of lube oil pressure
C.activation of the fixed CO2 system for the emergency generator space
D.all of the above