單項(xiàng)選擇題

When disassembling or assembling an injection pump plunger and barrel you should （）

A.keep the parts immersed in diesel fuel
B.always keep the plunger and barrel together
C.work over a linoleum-type surface
D.all of the above

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單項(xiàng)選擇題

In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）

A.Used of bimetallic piston rings
B.Ring gap pre-tensioning
C.Thermal increase in ring-end clearance
D.Gas pressure acting against the back of the ring

單項(xiàng)選擇題

If the detergent type lubricating oil being used in a diesel engine is black, the oil （）

A.must be centrifuged
B.must by filtered
C.must be changed
D.is holding finely dispersed carbon in suspension

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