单选题 1分

A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fue...

A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and the speed remaining below normal. The probable cause is ____________.
  • A. engine overload
  • B. leaky valves
  • C. stuck or broken piston rings
  • D. low air injection pressure

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