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單項選擇題

While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）

A.Delivery check valve
B.Pump barrel
C.Tubing to the injector
D.Cam follower

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單項選擇題

Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

A.cylinder valves
B.compression rings
C.piston skirts
D.oil rings

單項選擇題

The highest loads applied to the diesel engine crankshaft main bearings are （）

A.axial loads
B.firing loads
C.inertia loads
D.centripetal loads

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