單項(xiàng)選擇題

A substantial increase in crankcase pressure could be an indication of （）

A.excessive lube oil pressure
B.the proper seating of new rings
C.a worn cylinder liner
D.a malfunctioning cylinder relief valve

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單項(xiàng)選擇題

Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）

A.starting the engine while hot
B.knurling the piston skirt
C.operating the engine overheated
D.scuff resistant piston rings

單項(xiàng)選擇題

Exhaust pipes for separate diesel engines can be combined only when （）

A.space limitations prevent separately run pipes
B.the engines are small auxiliary units
C.they are arranged to prevent gas backflow to each engine
D.a waste heat boiler is installed

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