單項選擇題

Which of the items listed causes a direct acting mechanical governor to operate the engine fuel control linkage?（）

A.Hydraulic oil pressure
B.Servomotor action
C.Flyweight centrifugal force
D.Relay motion

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單項選擇題

Combustion knock occurring in a diesel engine can be caused by （）

A.low coolant temperature
B.insufficient fuel
C.high ambient temperature
D.carbon buildup on the injector tips

單項選擇題

Crankcase explosions in propulsion diesel result from（）

A.the splashing of lubrication oil by the crankshaft
B.the dilution of crankcase oil with particles of combustion
C.broken fuel lines spraying oil on the crankcase
D.the ignition of unburned fuel and air in the crankcase