单选题If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be （）Aexcessive compression pressureBair in the fuel linesChigh fuel pressureDexcessive load
单选题
If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be （）
A
excessive compression pressure
B
air in the fuel lines
C
high fuel pressure
D
excessive load
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