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單項選擇題

A dirty lube oil strainer can result in（）

A.crankcase
B.low lube oil temperature
C.excessive oil consumption
D.low bearing oil pressure

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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

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

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