單項選擇題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


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1.單項選擇題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

2.單項選擇題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