单项选择题

Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）

A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above

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B.Low firing pressure and high exhaust temperature
C.Low compression pressure and low exhaust temperature
D.Low firing pressure and low exhaust temperature

船舶电气与船舶安全

Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）