单项选择题

Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.

A.a shortened ignition delay period
B.a lean fuel/air mixture
C.excess fuel in the combustion chamber
D.rapid vaporization of injected fuel droplets

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Diesel engine control can be obtained by the bridge （）.

A.at any time
B.only after the engine room control station is switched to “bridge control”
C.whenever the secondary station is switched to "bridge control"
D.with the approval of the chief engineer only

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To determine if the lube oil filter elements need changing, （）.

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Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）

A.Exhaust and scavenging
B.Scavenging and compression
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D.Exhaust and compression