单项选择题
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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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 -
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The highest loads applied to the diesel engine crankshaft main bearings are （）
A.axial loads
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For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
A.moving the governor control to stop
B.shutting off the lubricating oil supply
C.tripping the governor emergency stop lever
D.shutting off the fuel supply
