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單項選擇題

Differential needle valves used in fuel injectors are directly closed by（）

A.cam action
B.spring force
C.fuel oil pressure
D.firing pressure

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單項選擇題

In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）

A.An open vent in the cooling system
B.A fouled sea chest
C.A restricted water passage in the engine
D.Air entrained in the cooling water

單項選擇題

Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）

A.injection pressure
B.shape of combustion space
C.turbulence in combustion space
D.all of the above