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