單項(xiàng)選擇題

Intercoolers installed on starting air compressors, reduce the possibility of（）

A.dust entering the high pressure stage
B.lube oil carbonization
C.discharge pulsations
D.inter-stage vapor lock

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單項(xiàng)選擇題

The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （）

A.increased compression ratio
B.decreased compression ratio
C.increased bearing clearance
D.decreased bearing clearance

單項(xiàng)選擇題

Which of the following statements is true concerning the cetane number rating of diesel fuel? （）

A.The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbon
B.The higher the cetane number, the shorter the ignition lag
C.The highest cetane number of fuel is 100
D.All of the above